Where does “дзеркальце” come from?

дзеркальце (Ukrainian) comes from Ukrainian -це́, from Ukrainian -ко, from Proto-Slavic -ьko.

Ancestry of “дзеркальце”, step by step

StepLanguageWordMeaning
1Ukrainian-це́y, -ling
2Ukrainian-коCreates diminutives of normally neuter nouns and adverbs, normally having a colloquial register
3Proto-Slavic-ьko—
Every word from Proto-Slavic -ьko →Every word from Ukrainian -ко →Every word from Ukrainian -це́ →