Where does “Crauciuc” come from?

Crauciuc (Romanian) comes from Ukrainian Кравчу́к, from Ukrainian -у́к, from Proto-Slavic *-ukъ.

Ancestry of “Crauciuc”, step by step

StepLanguageWordMeaning
1UkrainianКравчу́к—
2Ukrainian-у́кAdded to an often diminutive stem to form a patronymic or matronymic surname
3Proto-Slavic*-ukъ—
Every word from Proto-Slavic *-ukъ →Every word from Ukrainian -у́к →Every word from Ukrainian Кравчу́к →