セイコMeanings1nounSeiko (female given name)female term, language, or nameCommon female given name in Japan.セイコさんは私わたしの友とも達だちです。Seiko is my friend.2nounSeiko (company name)company nameRefers to the Seiko group, known for watches and other products.セイコーは日本にほんの有ゆう名めいな時計とけいメーカーです。Seiko is a famous Japanese watch manufacturer.