Frank Xavier Leyendecker (1877–1924), American illustrator (younger brother of J. C. Leyendecker)
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Ulrich Leyendecker (b. 1946), German composer of contemporary classical music
Reputedly, he was one of a number of male models -- Fredric March, Reed Howes, and J. C. Leyendecker's partner Charles Beach (1886–1952) were others—for the Arrow Collar Man in the Arrow collar ads illustrated by Leyendecker for the Cluett Peabody shirt company.