What does Boxing Day have to do with boxing?
Old English heorð "hearth, fire," in transferred use "house, home," from West Germanic *hertho "burning place" (cf. Old Saxon and Old Frisian herth, Middle Dutch hert, Dutch haard, German Herd "floor, ground, fireplace"), from PIE *kerta-, from root *ker- "heat, fire" (see carbon).
Heb. ah (Jer. 36:22, 23; R.V., "brazier"), meaning a large pot like a brazier, a portable furnace in which fire was kept in the king's winter apartment. Heb. kiyor (Zech. 12:6; R.V., "pan"), a fire-pan. Heb. moqed (Ps. 102:3; R.V., "fire-brand"), properly a fagot. Heb. yaqud (Isa. 30:14), a burning mass on a hearth.