Brewer's: Zim and Jim
“His house was made a habitation for Zim and Jim, and every unclean thing” (Godly Man's Portion, 1663). The marginal reading of Isa. xii. 21, 22, explains Zim to be wild beasts, and Jim jackals.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894