Where does “whiny” come from?

Whiny derives from English whine plus the suffix -y, from Middle English -y, from Middle French -ie, from Latin -ia, ultimately from Proto-Indo-European -kos.

whiny (English): whining; tending to whine or complain

Definitions

whining; tending to whine or complain

Ancestry of “whiny”, step by step

Step	Language	Word	Meaning
1	English	-y	Added to nouns and adjectives to form adjectives...
2	Middle English	-y	Designates an adjective, in many cases formed by...
3	Old English	-iġ	-y, -ic
4	Proto-West Germanic	-g	Forms adjectives from nouns and verbs with a...
5	Proto-Germanic	-gaz	-y
6	Proto-Indo-European	-ḱos	-y, -ic

Words derived from “whiny”

whininess
whinily

Every word from Proto-Indo-European -ḱos →Every word from English -y →Every word from Old English -iġ →