Overview
Kenneth MacKenna (born Leo Mielziner Jr.; August 19, 1899 – January 15, 1962) was an American actor and film director.
Family
MacKenna was born as Leo Mielziner Jr. in Canterbury, New Hampshire, to portrait artist Leo Mielziner (December 7, 1868 - August 11, 1935), the son of a prominent Reform rabbi (Moses Mielziner) and Ella Lane McKenna Friend (March 18, 1873 – February 2, 1968).
Although Kenneth changed his name from Mielziner to MacKenna for stage purposes, it was taken from family roots. Ella's mother’s maiden name was Margaret A. McKenna, and Ella was also named McKenna. So it seemed natural for Leo, Jr., to take MacKenna as his stage surname, changing the spelling slightly.
From Wikipedia (CC BY-SA 4.0).