From Wiktionary, the free dictionary
From -ö- (linking vowel) -ny (nominal-forming suffix).
-öny
- (nominal-forming suffix) Added to a word to form a noun or an adjective.
- ölt (“to stitch”) -öny → öltöny (“(men's) suit”)
- (nominal-forming suffix) Variants:
- -ny is added to words ending in a vowel
- -any is added to back-vowel words ending in a consonant
- -ony is added to back-vowel words ending in a consonant
- -eny is added to unrounded front-vowel words ending in a consonant
- -öny is added to rounded front-vowel words ending in a consonant