Sons of thunder, a surname given by our Lord to James and John
(Mark 3:17) on account of their fervid and impetuous temper
(Luke 9:54).
Smith's Dictionary
a name signifying sons of thunder, given by our Lord to the two sons of Zebedee, James and John, probably on account of their fiery earnestly. (Mark 3:17) See (Luke 9:54; Mark 9:38) comp. Matt 20:20 etc.