西せい友ゆうせいゆうFreq.FrequencyTop 50,000Meanings1nounSeiyū (surname)family or surnameJapanese family name.西せい友ゆうさんというお客きゃく様さまがいらっしゃいました。A customer named Seiyū-san has arrived.2nounSeiyu (Japanese supermarket chain)company nameMajor Japanese supermarket chain, now a subsidiary of Walmart.