Austin is an English masculine given name, an Old French language contraction of Agustin as Aostin, Austin (regular disappearing of intervocalic  from Late Latin to Old French, compare month August : Old French aüst / aoust, French août. 
Agustin is the popular form of Augustin,
 equivalent to Augustine. Variations of the name include Austen and Auston.
 
Austin Abrams (born 1996), American actor
Austin Adamec (born 1988), American musician
Austin Adams (disambiguation), multiple people
Austin Adarraga (born 1965), Spanish squash player
Austin Ainge (born 1981), American basketball coach and player
Austin Allen (disambiguation), multiple people
Austin M. Allran (born 1951), American politician
Austin D. Alvord (1843–1924), American politician
Austin Amelio (born 1988), American actor
Austin Amissah (1930–2001), Ghanaian lawyer
Austin Andrews (born 1985), Canadian film editor
Austin App (1902–1984), German-American professor
Austin Appleby (born 1993), American football player
Austin Ardill (1917–2010), Northern Irish politician
Austin Aries (born 1978), American professional wrestler
Austin Armacost (born 1988), American television personality
Austin Arnett (born 1991), American mixed martial artist
Austin Asche (born 1925), Canadian judge
Austin Austin (1855–1925), Australian politician
Austin Aviza (born 1997), American soccer player