Coser is a surname. Notable people with the surname include: Achille Coser (born 1982), Italian footballer. George Lucas Coser (born 1984), Brazilian footballer. Lewis A. Coser (1913–2003), American sociologist. Rose Laub Coser (1916–1994), German-American sociologist, educator, and social justice activist. See also. Boards of Cooperative Educational Services, a program in New York State that provides cooperative services (CoSer) "Coser" as shortened spelling of "cosplayer"
https://en.wikipedia.org/wiki/Coser