en.wiktionary.orgCyr - Wiktionary, the free dictionary Contents From Wiktionary, the free dictionary See also: CYR Cyr (plural Cyrs) A surname. According to the 2010 United States Census, Cyr is the 3029th most common surname in the United States, belonging to 11829 individuals. Cyr is most common among White (95.44%) individuals. RYC, cry