How did Doris Day get her name?

Doris Day was born Doris Mary Ann Kappelhoff.

Day had her first professional jobs as a vocalist on the WLW radio program Carlin's Carnival and in a local restaurant, Charlie Yee's Shanghai Inn. During her radio performances, Day first caught the attention of Barney Rapp, who was looking for a girl vocalist and asked if Day would like to audition for the job.

While working for Rapp in 1939, she adopted the stage surname "Day" at Rapp's suggestion. Rapp felt that "Kappelhoff" was too long for marquees, and he admired her rendition of the song "Day After Day".