Where does “Tadzhik” come from?

Tadzhik (English) comes from Russian таджи́к, from Persian تاجیک, from Middle Persian tʾcyk', from Arabic طَيِّء — name of an Arab clan.

Ancestry of “Tadzhik”, step by step

StepLanguageWordMeaning
1Russianтаджи́кTajik male
2Persianتاجیکnon-Turk; Tajik
3Middle Persiantʾcyk'Arab; swift, fast
4Arabicطَيِّءname of an Arab clan
Every word from Arabic طَيِّء →Every word from Middle Persian tʾcyk' →Every word from Persian تاجیک →