Birth Name: Cameron Riley Monaghan (also listed as Cameron Riley Karolkowski)
Place of Birth: Santa Monica, Los Angeles, California, United States
Date of Birth: August 16, 1993
Ethnicity: Polish, Irish, possibly German, and other
Cameron Monaghan is an American actor and model. His mother, Diane, has Polish and Irish ancestry. The surname Monaghan comes from her family tree.
Cameron’s maternal grandfather is Peter J. Karolkowski (the son of Peter Karolkowski and Elizabeth Monaghan). Cameron’s grandfather Peter was born in New York.
Source: Genealogy of Cameron Monaghan (focusing on his mother’s side) – https://www.geni.com