Thaddea \th(ad)-dea\ as a girl's name is of Aramaic origin, and the meaning of Thaddea is "heart". Feminine form of Thaddeus.

Thaddea has 7 variant forms: Tada, Tadda, Taddie, Thada, Thadda, Thadee and Thaddie.

Baby names that sound like Thaddea are Theda, Thida, Theida and Teddey.