KidamuraJapanese From 木 (ki) meaning "tree, wood", 貴 (ki) meaning "valuable", or 喜 (ki) meaning "rejoice", combined with 田 (da) meaning rice paddy, field" and 村 (mura) means "hamlet, village".
KidoJapanese From Japanese 木 (ki) meaning "tree, wood" or 城 (ki) meaning "castle" combined with 戸 (to) meaning "door".
KimotoJapanese Derived from the Japanese kanji 木 (ki) or 樹 (ki) both meaning "tree, wood, plant" combined with 本 (moto) or 元 (moto) both meaning "base, root, origin".... [more]
KiryuinJapanese (?), Popular Culture (?) Either from 桐生 (Kiryu), a place name, combined with 院 (in) meaning "college" or 鬼 (ki, oni) meaning "demon" and 龍 (ryu) meaning "dragon, imperial" combined with 院 (in) meaning "college".
KitadaiJapanese From 北 (kita) meaning "north" and 代 (dai) meaning "society, world, cost, price" or 台 (dai) meaning "Taiwan, machine or vehicle counter, stand, pedestal".
KoiwaiJapanese From 小 (ko) meaning "little, small" combined with 岩 (iwa) meaning "stone" and 井 (i) meaning "pit, mineshaft, well" or 祝 (iwai) meaning "blessing, celebrate, congratulations".
KomatsuzakiJapanese (Rare) Ko ("Small") + Matsu ("Pine Tree") + Zaki ("Peninsula, Cape"). This is a uncommon name, but it has kanji that 90% of Japanese family names have.