Namesakes

Belgian Prime Ministers: 3 prime ministers
Joseph Lebeau (a.k.a. Louis)   1831; 1840-1841  
Jules Renkin (a.k.a. Louis)   1931-1932  
Joseph Pholien (a.k.a. Louis)   1950-1952  
Bohemian Kings: 1 king
King Ludvík (a.k.a. Louis)   1516-1526  
Canadian Prime Ministers: 1 prime minister
Louis St. Laurent   1948-1957  
Dutch Prime Ministers: 1 prime minister
Louis Beel   1946-1948; 1958-1959  
Fictional Characters from Books: 1 character, 1 hero
Louis Trevelyan   1869   He Knew He Was Right  
André-Louis Moreau   1921   Scaramouche  
Fictional Characters from Television: 1 character
Lou Carpenter (a.k.a. Louis)   1985   Neighbours  
Frankish and French Kings: 22 kings, 1 emperor
King Clovis I (a.k.a. Louis)   481-511  
King Clovis II (a.k.a. Louis)   639-655  
King Clovis III (a.k.a. Louis)   675-676  
King Clovis IV (a.k.a. Louis)   691-695  
King Louis I the Pious   814-840  
King Louis II the Stammerer   877-879  
King Louis III   879-882  
King Louis IV the Foreigner   936-954  
King Louis V the Indolent   986-987  
King Louis VI the Fat   1108-1137  
King Louis VII   1137-1180  
King Louis VIII the Lion   1223-1226  
King Louis IX   1226-1270  
King Louis X   1314-1316  
King Louis XI the Spider   1461-1483  
King Louis XII of Orleans   1498-1515  
King Louis XIII   1610-1643  
King Louis XIV the Sun King   1643-1715  
King Louis XV   1715-1774  
King Louis XVI   1774-1792  
King Louis XVIII   1814-1824  
King Louis Philippe   1830-1848  
Emperor Napoleon III (a.k.a. Louis)   1852-1870  
French Presidents and Prime Ministers: 8 prime ministers, 3 presidents, 1 prime minister/president
(prime minister/president) Adolphe Thiers (a.k.a. Louis)   1836; 1840; 1871-1873  
(prime minister) Louis-Mathieu Molé   1836-1839; 1848  
(prime minister) Louis-Eugène Cavaignac   1848  
(president) Louis-Napoléon Bonaparte   1848-1852  
(prime minister) Louis-Jules Trochu   1870-1871  
(prime minister) Ernest Courtot de Cissey (a.k.a. Louis)   1874-1875  
(prime minister) Louis Buffet   1875-1876  
(prime minister) Charles de Freycinet (a.k.a. Louis)   1879-1880; 1882; 1886; 1890-1892  
(prime minister) Émile Combes (a.k.a. Louis)   1902-1905  
(prime minister) Louis Barthou   1913  
(president) Paul Deschanel (a.k.a. Louis)   1920  
(president) Alain Poher (a.k.a. Louis)   1969; 1974  
German Kings and Holy Roman Emperors: 2 king/emperors, 1 king
King/Emperor Ludwig I the Pious (a.k.a. Louis)   814-840  
King Ludwig III the Child (a.k.a. Louis)   899-911  
King/Emperor Ludwig IV (a.k.a. Louis)   1314-1347  
Haitian Presidents: 6 presidents
(president) Jean-Louis Pierrot   1845-1846  
(president) Lysius Salomon (a.k.a. Louis)   1879-1988  
(president) Florvil Hyppolite (a.k.a. Louis)   1889-1896  
(president) Louis Borno   1922-1930  
(president) Louis Eugène Roy   1930  
(president) Élie Lescot (a.k.a. Louis)   1941-1946  
Hall-of-Famers: 1 baseball
(baseball) Louis Santop   2006  
Hungarian Kings and Queens: 2 kings
King Lajos I the Great (a.k.a. Louis)   1342-1382  
King Lajos II (a.k.a. Louis)   1516-1526  
Nobel Prize Winners: 2 medicine, 2 physics, 1 peace
(peace) Louis Renault   1907  
(medicine) Charles Louis Alphonse Laveran   1907  
(physics) Louis de Broglie   1929  
(physics) Louis Néel   1970  
(medicine) Louis Ignarro   1998  
Notable Actors and Actresses: 4 actors
Louis de Funès   1914-1983  
Louis Zorich   1924-2018  
Louis Gossett, Jr.   1936-  
Lou Diamond Phillips (a.k.a. Louis)   1962-  
Notable Artists: 1 architect, 1 painter
Jacques-Louis David   1748-1825  
Louis Sullivan   1856-1924  
Notable Athletes: 2 baseball, 2 rugby, 1 football, 1 soccer
(baseball) Louis Santop   1890-1942  
(soccer) Louis van Gaal   1951-  
(rugby) Louis Stanfill   1985-  
(rugby) Louis Picamoles   1986-  
(baseball) Lou Marson (a.k.a. Louis)   1986-  
(football) Manti Te'o (a.k.a. Louis)   1991-  
Notable Businesspeople: 2 businesspersons
Louis Cartier   1875-1942  
Louis Chevrolet   1878-1941  
Notable Explorers and Adventurers: 2 explorers
Louis Hennepin   1626-1705  
Louis Antoine de Bougainville   1729-1811  
Notable Musicians: 3 composers, 1 musician
Louis-Claude Daquin   1694-1772     
Hervé (a.k.a. Louis)   1825-1892   operetta  
Louis Armstrong   1901-1971     
Leonard Bernstein (a.k.a. Louis)   1918-1990     
Notable Philosophers and Thinkers: 1 mathematician
Joseph Louis Lagrange   1736-1813  
Notable Scientists and Inventors: 3 inventors, 2 chemists, 1 physicist
Joseph Louis Gay-Lussac   1778-1850  
Louis Daguerre   1787-1851  
Louis Braille   1809-1852  
Louis Pasteur   1822-1895  
Louis Blériot   1872-1936  
Louis de Broglie   1892-1987  
Notable Writers: 1 author, 1 poet/author
Robert Louis Stevenson   1850-1894  
Louis Couperus   1863-1923  
Olympic Medalists: 8 gold, 7 bronze, 5 silver, 5 silver/gold, 1 bronze/silver, 1 bronze/silver/gold
(bronze) Louis Glineur   1900   archery - à la pyramide  
(bronze) Louis Martin   1900   swimming - 200 m team; swimming - 4000 m freestyle  
(bronze) Louis Laufray   1900   water polo  
(gold) Louis W. Maxson   1904   archery - team round  
(gold) Louis Handley   1904   swimming - 4x50 yard freestyle relay  
(silver) Albert Corey (a.k.a. Louis)   1904   4 mile team; marathon  
(bronze) Louis Wilkins   1904   pole vault  
(silver) Louis Vernet   1908   archery - continental style 50 m  
(bronze) Louis Bonniot de Fleurac   1908   3 mile team  
(silver) Lewis Tewanina (a.k.a. Louis)   1912   10000 m  
(gold) Louis Scott   1912   3000 m team  
(silver) Charles Lelong (a.k.a. Louis)   1912   4x400 m relay  
(bronze/silver/gold) Julien Brule (a.k.a. Louis)   1920   archery - moving target 28 m, team; archery - moving target 33 m; archery - moving target 33 m, team; archery - moving target 50 m; archery - moving target 50 m, team  
(bronze) Louis Balbach   1920   diving - springboard  
(gold) Louis Kuehn   1920   diving - springboard  
(silver/gold) Louis Delcon   1920   archery - moving target 28 m, team; archery - moving target 33 m, team; archery - moving target 50 m, team  
(silver/gold) Louis Fierens   1920   archery - moving target 28 m, team; archery - moving target 33 m, team; archery - moving target 50 m, team  
(silver/gold) Louis Van Beeck   1920   archery - moving target 28 m, team; archery - moving target 33 m, team; archery - moving target 50 m, team  
(silver/gold) Louis Van de Perck   1920   archery - large fixed target; archery - large fixed target, team; archery - small fixed target; archery - small fixed target, team  
(gold) Louis Clarke   1924   4x100 m relay  
(gold) Lou Jones (a.k.a. Louis)   1956   4x400 m relay  
(silver) Carole Quinton (a.k.a. Louis)   1960   80 m hurdles  
(gold) Bob Boozer (a.k.a. Louis)   1960   basketball  
(gold) Joe Caldwell (a.k.a. Louis)   1964   basketball  
(silver/gold) Sam Graddy (a.k.a. Louis)   1984   100 m; 4x100 m relay  
(bronze) Lou Marson (a.k.a. Louis)   2008   baseball  
(bronze/silver) Louis Smith   2008; 2012   artistic gymnastics  
Oscar Award Winners: 1 actor
(actor) Louis Gossett, Jr.   1982   An Officer and a Gentleman  
Other Royalty: 3 princes, 1 grand duke, 1 king
Louis II, Prince of Monaco   1922-1949   Monaco  
Jean, Grand Duke of Luxembourg (a.k.a. Louis)   1964-2000   Luxembourg  
Philippe (a.k.a. Louis)   2013-   Belgium  
George of Cambridge (a.k.a. Louis)   2013-   United Kingdom  
Louis of Cambridge   2018-   United Kingdom  
Polish High Dukes and Kings: 1 king
King Ludwik I (a.k.a. Louis)   1370-1382  
Portuguese Kings and Queens: 1 king
King Luís (a.k.a. Louis)   1861-1889  
Pulitzer Award Winners: 2 winners
Louis Bromfield   1927   Early Autumn  
Thomas Berger (a.k.a. Louis)   1984   The Feud  
Saints: 22 blessed, 9 saints
Saint Louis   ?-855  
Blessed Louis of Thuringia   1200-1227  
Saint Louis IX   1214-1270  
Saint Louis of Toulouse   1274-1297  
Blessed Ludovico Morbioli (a.k.a. Louis)   1433-1485  
Saint Luis Bertrán (a.k.a. Louis)   1526-1581  
Saint Luis Ibarachi (a.k.a. Louis)   1585-1597  
Blessed Louis Chakichi   ?-1622  
Blessed Louis Kawara   ?-1622  
Blessed Luis Flores (a.k.a. Louis)   ?-1622  
Blessed Louis Baba   ?-1624  
Blessed Luis Sasanda (a.k.a. Louis)   ?-1624  
Blessed Luis Sotelo (a.k.a. Louis)   ?-1624  
Blessed Louis Onizuka Naisen   ?-1626  
Blessed Louis Maki   ?-1627  
Blessed Louis Someyon   ?-1627  
Blessed Luis Bertrán the Younger (a.k.a. Louis)   ?-1627  
Blessed Louis Nifaki   ?-1628  
Saint Louis-Marie de Montfort   1673-1716  
Saint Luigi Scrosoppi (a.k.a. Louis)   1804-1884  
Blessed Ludovico of Casoria (a.k.a. Louis)   1814-1885  
Saint Jean-Louis Bonnard   1824-1852  
Blessed Louis-Zéphirin Moreau   1824-1901  
Blessed Luigi Monti (a.k.a. Louis)   1825-1900  
Blessed Luigi Tezza (a.k.a. Louis)   1841-1923  
Blessed Luigi Guanella (a.k.a. Louis)   1842-1915  
Blessed Luigi Talamoni (a.k.a. Louis)   1848-1926  
Saint Luigi Orione (a.k.a. Louis)   1872-1940  
Blessed Luigi Variara (a.k.a. Louis)   1875-1923  
Blessed Luigi Beltrame Quattrocchi (a.k.a. Louis)   1880-1951  
Blessed Louis Versiglia   ?-1930  
Shakespearian Characters: 2 characters
Lewis the Dauphin (a.k.a. Louis)   Henry V; King John  
Lewis XI (a.k.a. Louis)   Henry VI (3)  
Spanish Kings and Queens: 1 king
King Luis I (a.k.a. Louis)   1724  
Swedish Prime Ministers: 2 prime ministers
Louis Gerhard De Geer   1876-1880  
Louis De Geer   1920-1921