hinny

Etymology 1

From Latin hinnus – possibly cognate with hinnire (“to whinny”).

noun

1. The hybrid offspring of a stallion (male horse) and a she-ass (female donkey).
   The curer said nothing to the cowboy but went straight to the mule, or hinny, rather, being out of San's big jenny by Alder's white horse. 2001, Ursula K. Le Guin, “On the High Marsh”, in Tales from Earthsea

Etymology 2

Alteration of whinny, which is onomatopoeic.

verb

1. To whinny

Etymology 3

From standard English honey.

noun

1. (Tyneside) A term of endearment usually for women.
   You will make a great diagnostician, nae doot, my hinny, but you need tae improve your bedside manner. 2016, Kerry Greenwood, Murder and Mendelssohn, Sydney: Allen and Unwin, page 310