KoiwaiJapanese, Popular Culture Ko means "Small", Iwa means "Stone", and I means "Well". Fictional characters with this last name: Yotsuba from the manga "Yotsuba&!" and Yoshino Koiwai from "Masamune-kun's Revenge" are examples of this.
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.
KumakiJapanese (Rare) The kanji in Anri Kumaki's name reads, Kuma ("Bear") + Ki ("Tree"). She is a singer and songwriter. There might be other combinations too, probably being , Ku ("Long Time") + Maki 1 ("Shepard").