Namesakes
Australian Prime Ministers:
1 prime minister
Joseph Lyons (middle name Aloysius) 1932-1939 
Fictional Characters from Television:
2 characters
Aloysius "Nosey" Parker 1965 Thunderbirds
Theo Huxtable (middle name Aloysius) 1984; 1987 The Cosby Show; A Different World
Hall-of-Famers:
1 baseball, 1 basketball
(baseball) Al Simmons 1953
(basketball) Patrick Ewing (middle name Aloysius) 2008
Irish Presidents and Prime Ministers:
1 prime minister
(prime minister) John A. Costello (middle name Aloysius) 1948-1951; 1954-1957
New Zealand Prime Ministers:
1 prime minister
Frederick Weld (middle name Aloysius) 1864-1865
Notable Actors and Entertainers:
4 actors
Barnard Hughes (middle name Aloysius) 1915-2006
Keenan Wynn (middle name Aloysius) 1916-1986
Chuck Connors (middle name Aloysius) 1921-1992
Nick Adams (middle name Aloysius) 1931-1968
Notable Athletes:
1 baseball, 1 baseball/basketball, 1 basketball, 1 soccer
(baseball) Al Simmons 1902-1956
(baseball/basketball) Chuck Connors (middle name Aloysius) 1921-1992
(soccer) Louis van Gaal (a.k.a. Aloysius) 1951-
(basketball) Patrick Ewing (middle name Aloysius) 1962-
Olympic Medalists:
2 gold
(gold) Jim Bausch (middle name Aloysius) 1932 decathlon
(gold) Patrick Ewing (middle name Aloysius) 1984; 1992 basketball
Saints:
3 blessed, 1 saint
Blessed Aloysius Rabata ?-1490
Saint Aloysius Gonzaga 1568-1591
Blessed Columba Marmion (middle name Aloysius) 1858-1923
Blessed Alojzije Stepinac (a.k.a. Aloysius) 1898-1960