Birth Name: William Reibert Mapother
Place of Birth: Louisville, Jefferson, Kentucky, United States
Date of Birth: April 17, 1965
Ethnicity: German, English, Irish, distant Welsh, Cornish, and Scottish
William Mapother is an American actor.
He is the son of Louisa and William Reibert Mapother. His first cousin is actor Tom Cruise (born Thomas Cruise Mapother IV). Their fathers are siblings.
William’s paternal grandfather was Thomas Cruise Mapother II (the son of Thomas O’Mara, whose name was later changed to Thomas Cruise Mapother, and of Anna Stewart Bateman). William’s grandfather Thomas was born in Kentucky. William’s great-grandfather Thomas O’Mara’s parents, Thomas O’Mara and Mary Paulina Russell Cruise, were both of Irish descent. William’s great-grandmother Anna was the daughter of Thomas J. Bateman and Elvira Eva Tompkins/Thompkins, and had English, Welsh, Irish, Scottish, and Cornish ancestry.
William’s great-great-grandmother, Mary Cruise, married twice. Her first husband was Dillon Henry Mapother, by whom she had six children. After Dillon’s death, she remarried to Thomas O’Mara. Their son, who was born as Thomas O’Mara, was listed under that name in the 1880 Census. His name was later changed to Thomas Cruise Mapother. The reason(s) for him changing his name are not clear.
William’s paternal grandmother was Catherine Louise Reibert (the daughter of William Reibert and Charlotte Louise Voelker). Catherine was born in Kentucky. William’s great-grandparents William and Charlotte were both of German descent. William’s great-grandfather William Reibert was the son of Adam Andrew Reibert and Francisca/Francis/Frances Boesser. Charlotte was the daughter of John Voelker and Louisa Steadle.
William’s maternal grandfather was Charles E. Riehm (the son of John Lawrence Riehm and Minnie C. Phelan). Charles was born in Kentucky. John was of German descent. Minnie’s father was Irish.
William’s maternal grandmother was Katherine Amelia Grigsby (the daughter of Beverly Prewitt Grigsby and Louisa Amelia Baldwin). Katherine was born in Kentucky. Beverly was the son of Beverly Pruett Grigsby and Katherine Ella Willis. Louisa was the daughter of Alvin Burr Baldwin and Louisa Amelia Barber.
Sources: Genealogy of William Mapother – http://wc.rootsweb.ancestry.com
Genealogy of William Mapother (focusing on his father’s side) – https://www.geni.com
William’s maternal grandfather, Charles E. Riehm, on the 1920 U.S. Census – https://familysearch.org
Charles E. Riehm on the 1930 U.S. Census – https://familysearch.org
Genealogy of William’s maternal great-grandfather, Beverly Prewitt Grigsby (focusing on his father’s side) – http://wc.rootsweb.ancestry.com
His Welsh part isn’t mentioned.