Whiny, whiney, whinny, Whinney
Whiny is an adjective meaning habitually complaining or of or like a whine.
Whiney is the same as whiny, but it appears about a fourth as often (whiny is preferred in all main varieties of English).
Whinny is the sound horses make. It’s synonymous with neigh.
Whinney is (1) a surname, (2) an unusual spelling of the female first name usually spelled Winnie, and (3) part of a few place names (e.g., Whinney Hill, Whinney Banks).