GADDIS Găd’ əs (Γαδδί, 1 Macc 2:2). This was the surname of John (KJV Johanan), the son of Mattathias and eldest brother of Judas Maccabeus. With the latter he joined in the struggle for Jewish independence in the 2nd cent. b.c.

International Standard Bible Encyclopedia (1915)

(A Gaddis; Kaddis; the King James Version Caddis):

Surname of John, the eldest brother of Judas Maccabeus ( 1Macc 2:2).