Birth Name: Matthew F. Bair
Place of Birth: Seaford, New York, U.S.
Date of Birth: June 2, 1987
Ethnicity: Ashkenazi Jewish, possibly other
Matthew Koma is an American singer, songwriter, DJ, and record producer.
He is the son of Rhonda and Gerald Bair.
Matthew has stated that he celebrates Jewish holidays with his grandmother. Matthew’s mother is Jewish. It is not clear if Matthew’s father is Jewish as well.
Matthew is married to actress and singer Hilary Duff, with whom he has two children.
Matthew’s paternal grandmother was named Beverly.
Matthew’s maternal grandfather is named Fred Kahan.
Matthew’s maternal grandmother is Rosalyn/Roslyn Zahler (the daughter of Samuel/Sam Zahler and Frieda/Freda Teitel/Teitelbaum). Roslyn was born in New York, to Jewish parents from Galicia. Samuel was the son of Isidor Zahler and Ida Huett. Frieda was the daughter of Solomon Teitel and Yetta/Jetta Sivaller.
Sources: Mention of Matthew’s parents – http://www.newsday.com
Matthew’s maternal grandmother, Rosalyn/Roslyn Zahler, on the 1930 U.S. Census – https://www.familysearch.org