The name Thaddeus is used to a great extent; it has 56 variant transcriptions that are used in English and other languages. Variation transcriptions used in English include Addai, Tadd (used in Welsh too), Taddeus, Taddeusz, Taddy, Tadeus, Tadio, Tahd, Thadd, Thaddaeus, Thaddaos, Thaddeau, Thaddeaus, Thaddiaus, Thaddis, Thaddius, Thade, Thadeaou, Thadeaus, Thadeous, Thadia, Thadieus, Thadious, Thadius, and Thadus. The short forms Tad (used in Irish, Latin, and Welsh too) and Thad, and the pet forms Thaddy and Thadis are other English variants.
Foreign variant transcriptions of Thaddeus include Faddei (Russian), Faddey (Russian), Fadey (Russian and Ukrainian), Taco (Dutch), Taddeo (Italian), Tade (Hungarian), Tadeas (Czech), Tadeás (Czech and Slavic), Tadej (Slavic), Tadek (Polish), Tadeo (Italian and Spanish), Tades (Czech), Tadeu (Portuguese), Tadeusz (Polish), Tadey (Russian), Tadi (Albanian), Tako (Dutch), Thaddaios (Greek), Thaddaus (German), Thaddäus (German), Thaddej (Russian), Thaddeo (Italian), Thaddée (French), Thadee (French), and Thadeus (French). Specific foreign variants include the pet forms Tadzio (Polish and Spanish) and Thady (Irish).
Variant forms inherit the origin and thus the meaning of Thaddeus.
Thaddeus is an all-time favorite. At present it is still a somewhat popular baby boy name, but not as much as it was before. At the peak of its usage in 1918, 0.031% of baby boys were given the name Thaddeus. It had a ranking of #309 then. The baby name has steeply fallen in popularity since then, and it is of only very modest use in recent years. In 2018, it ranked at #710 with a usage of 0.018%, but it was nonetheless the 2nd most popular after Theodore, out of all boy names in its family. It was more widely used than Thaddeus by 21 times in 2018.
Baby names that sound like Thaddeus include Tacio, Tacitus, Tadashey, Tadashi, Tadashie, Tadashy, Taddeus, Taddeusz, Tadeas, Tadesuz, Tadeus, Tadeusz, Tadzea, Tadzio, Taezo, Taghea, Tahea, Taichi, Taiga, and Taishea.
† Pronunciation for Thaddeus: TH as in "theme (TH.IY.M)" ; AE as in "at (AE.T)" ; D as in "day (D.EY)" ; IY as in "eat (IY.T)" ; AH as in "mud (M.AH.D)" ; S as in "see (S.IY)"