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 English, and other
Cameron Monaghan is an American actor and model. The surname Monaghan comes from his mother’s 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. Cameron’s great-grandfather Peter was the son of Polish parents, Paul Karolowski and Jennie Olschewska. Elizabeth was the daughter of James Francis Monaghan and Elizabeth Mary Weyant.
Source: Genealogy of Cameron Monaghan (focusing on his mother’s side) – https://www.geni.com