Neiman was born in Saint Paul, Minnesota, the son of Lydia Sophia (née Serline) of Braham, Minnesota and Charles Julius Runquist, who were married in 1918, and living at Grasston, Minnesota (Kanabec County) in 1921. He was ofSwedish descent. His father deserted his family,leroy neiman prints and when his mother married his stepfather, John L. Niman (Neiman) in 1926, LeRoy changed to the new surname as well. His mother divorced Neiman about 1935, and married for the third time in about 1940, to Ernst G. Hoelscher, of St. Paul. She died in St. Paul, Minnesota, November 14, 1985, at age 87 years. LeRoy was raised in the Macalester-Groveland, and Frogtown neighborhoods of St. Paul. The home he lived in the longest, from about 1940 to about 1955, still stands at 569 Van Buren Avenue, in St. Paul.