Ondrasik is of Slovakian descent. His year of birth has been subject to some confusion, with Encyclopedia.com listing his birth year as 1968 instead of 1965. A 2001 Los Angeles Times article refers to him being 33 at the time rather than 36. A March 2002 interview from the Pittsburgh Post-Gazette gives his age as 33 at the time rather than 37. However, Ondrasik himself has implied that the 1965 date is the correct one, such as in 2020 when he referred to recently turning 55.