Green’s Dictionary of Slang

(US) a person’s name.

1910		‘Doss Chiderdoss’ ‘A Somnolent Suitor’ Sporting Times 21 May 1/3: ’Twas a Mrs. Van Winkle, a quaint name, I think, / And her husband’s front label was Rip.
1914		T.A. Dorgan Indoor Sports 11 Aug. [synd. cartoon] Indoor Sports — Suggesting a Label for the New baby.
1938		W. Watson Miss Pettigrew Lives For A Day (2000) 64: ‘What’s the full label?’ asked Miss LaFosse [...] ‘Pettigrew,’ said Miss Pettigrew. ‘Guinevere Pettigrew.’.
1941		C.S. Johnson Growing Up in the Black Belt 1: [H]is complexion is so dark his associates have affectionately labeled him ‘Crow.’ He does not object to this label.
1950		Goldin et al. DAUL 121/1: Label. A person’s name, whether genuine or fictitious.
1958		Mad mag. May–June 20: Put down your old man and lose that label.