Where does “Կույումջյան” come from?

Կույումջյան (Armenian) comes from Turkish kuyumcu, from Turkish -çü, from Ottoman Turkish ـجی, from Proto-Turkic -či — Profession suffix.

Ancestry of “Կույումջյան”, step by step

StepLanguageWordMeaning
1Turkishkuyumcujeweller, goldsmith; jeweller's
2Turkish-çüSuffix appended to words to create a noun,...
3Ottoman Turkishـجیoccupational suffix
4Proto-Turkic-čiProfession suffix
Every word from Proto-Turkic -či →Every word from Ottoman Turkish ـجی →Every word from Turkish -çü →