A real stretch, but: She & Him: one subjective and one objective pronoun.
Ooh! Ooh! I’ve got one! Mutt and Jeff.
Sorry, but no. The characters’ names were Augustus Mutt and Othello Jeff.
Phooey.
Fictional One but I think it counts: (sort of)
Laverne and Shirley’s:
Lenny (Leonard Kosnowski) & Squiggy (Andrew Squigman)
P.G. Wodehouse’s double act, Mike & Psmith.
Or the music hall triple act, Wilson, Keppel and Betty
Country duo Big and Rich are named after “Big” Kenny Alphin and John Rich. That’s nickname and last name, much like Richard “Cheech” Marin and Tommy Chong
Peaches & Herb?
d&r
Calvin and Hobbes?