Where does “Costică” come from?

Costică (Romanian) comes from Romanian Constantin, from Latin Constantinus, from Latin -īnus, from Proto-Italic -īnos, from Proto-Indo-European -iHnos, from Proto-Indo-European -no- — adjectival suffix.

Ancestry of “Costică”, step by step

Costică traces back through two separate lines of ancestry.

via Romanian Constantin

StepLanguageWordMeaning
1RomanianConstantin
2LatinConstantinus
3Latin-īnusof or pertaining to; -ine
4Proto-Italic-īnosof/belonging to
5Proto-Indo-European-iHnosCreates adjectives of materials
6Proto-Indo-European-no-adjectival suffix

via Romanian Costea

StepLanguageWordMeaning
1RomanianCostea
2RussianКостя
Every word from Proto-Indo-European -no-