Namesakes
Bulgarian Kings and Tsars:
4 tsars
Tsar Petar I 927-969 
Tsar Petar II 1040-1041
Tsar Petar III 1072
Tsar Petar IV 1185-1197
Bulgarian Presidents and Prime Ministers:
2 presidents, 2 prime ministers
(prime minister) Petar Gudev 1907-1908
(prime minister) Petar Gabrovski 1943
(president) Petar Mladenov 1990
(president) Petar Stoyanov 1997-2002
Notable Athletes:
1 chess, 1 handball, 1 soccer, 1 water polo
(chess) Petar Genov 1970-
(handball) Petar Metličić 1976-
(water polo) Petar Muslim 1988-
(soccer) Tom Rogić (a.k.a. Petar) 1992-
Notable Musicians:
1 singer
Petar Grašo 1976-
Notable Writers:
2 authors
Petar Zoranić 1508-1569
Petar Šegedin 1909-1998
Olympic Medalists:
3 gold, 1 bronze, 1 bronze/silver, 1 silver
(gold) Petar Šegvić 1952 rowing
(silver) Petar Skansi 1968 basketball
(bronze) Petar Petrov 1980 100 m
(bronze/silver) Petar Trbojević 2000; 2004 water polo
(gold) Petar Metličić 2004 handball
(gold) Petar Muslim 2012 water polo
Saints:
1 saint
Saint Petar I of Bulgaria ?-970
Serbian Kings, Tsars and Princes:
2 kings
King Petar I 1903-1921
King Petar II 1934-1945