君不见伊人莫相忘
[jūn bù jiàn yī rén mò xiāng wàng]
It comes from a poetic phrase. '君不见' means 'Have you not seen', and '伊人莫相忘' means the person should not be forgotten. This kind of name often refers to memories or deep emotions toward someone, emphasizing not forgetting them despite the passage of time.