Green’s Dictionary of Slang

a generic term for any Jew.

1900		Bulletin (Sydney) 8 Dec. 20/1: The sportsman who sat on my left conveyed his impression of the youth in a brief whisper – ‘Mug! [...] Solly has him set. Just you watch how he’ll pal up to him for a little business.’.
1912		Bulletin (Sydney) 8 Aug. 44/2: I’ll eat steak an’ oysters any time yous like – / Or a bit o’ fried fish cooked by Solly Ike.
1914		Wash. Herald (DC) 20 Dec. 40/1: ‘A Hebrew gentleman, eh?’ [...] ‘Oh, he’s a slick bird is Solly!’.
1950		C. Harris Three-Ha’Pence to the Angel 9: Hi, Solly-Olly!
1991		S.F. Examiner 3 July PD-12/4: Solly must always hide his Jewish member from Aryan eyes.