Strong's G2280 · Greek

Θαδδαῖος

Thaddaios · thad-dah'-yos

of uncertain origin; Thaddaeus, one of the Apostles

Scholarly Lexicons

Abbott-Smith Manual Greek Lexicon

 2 Θαδδαῖος , -ου, ὁ (Aram. תַּדִאַי , תַּדַּי ), Thaddæus : Mt 10:3 , Mk 3:18 (WH, mg., Λεββαῖος , q.v.).† 

G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain