Birth Name: Harmon Clayton Killebrew
Place of Birth: Payette County, Idaho
Date of Birth: June 29, 1936
Ethnicity: English, Irish
Family Background: Harmon Killebrew was an American professional baseball first baseman, third baseman, and left fielder.
Harmon Killebrew was the son of Harmon Clayton Killebrew Sr. and Katherine Pearl (May) Killebrew.
Killebrew’s paternal grandparents were Culver Killebrew (the son of James Ivy Killebrew and Mahala Crosby) and Frances Alice Weaver (the daughter of Harmon Weaver and Sarah Roberts).
Killebrew’s maternal grandparents were William May (the son of John May and Eliza Jane Ruyle) and Sarah E. Faris (the daughter of Elijah Faris and Frances Gilland Griffin).
Frances was the daughter of William Griffin and Anna Delia McLain. McLain and sometimes Griffin are surnames of Irish origin.
Source: Geni.com
https://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=18836531 (obituary of Killebrew’s father)
https://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=18836542 (obituary of Killebrew’s mother)