Namesakes
Australian Prime Ministers:
1 prime minister
Joseph Lyons (a.k.a. Aloysius) 1932-1939 
Fictional Characters from Television:
2 characters
Aloysius "Nosey" Parker 1965 Thunderbirds
Theo Huxtable (a.k.a. Aloysius) 1984; 1987 The Cosby Show; A Different World
Hall-of-Famers:
1 baseball, 1 basketball
(baseball) Al Simmons 1953
(basketball) Patrick Ewing (a.k.a. Aloysius) 2008
Irish Presidents and Prime Ministers:
1 prime minister
(prime minister) John A. Costello (a.k.a. Aloysius) 1948-1951; 1954-1957
New Zealand Prime Ministers:
1 prime minister
Frederick Weld (a.k.a. Aloysius) 1864-1865
Notable Actors and Entertainers:
1 actor
Keenan Wynn (a.k.a. Aloysius) 1916-1986
Notable Athletes:
1 baseball, 1 basketball, 1 soccer
(baseball) Al Simmons 1902-1956
(soccer) Louis van Gaal (a.k.a. Aloysius) 1951-
(basketball) Patrick Ewing (a.k.a. Aloysius) 1962-
Olympic Medalists:
2 gold
(gold) James Bausch (a.k.a. Aloysius) 1932 decathlon
(gold) Patrick Ewing (a.k.a. Aloysius) 1984; 1992 basketball
Saints:
3 blessed, 1 saint
Blessed Aloysius Rabata ?-1490
Saint Aloysius Gonzaga 1568-1591
Blessed Columba Marmion (a.k.a. Aloysius) 1858-1923
Blessed Alojzije Stepinac (a.k.a. Aloysius) 1898-1960