ثمينة (Arabic) Thamina
سمينة (Arabic) Samina
سامينا (Arabic) Samina
Meaning: a variant transcription of Thamina which possibly means "healthy" in Arabic, though I've also seen it listed as meaning "precious" or invaluable".
It's also a feminine adjective meaning "fat" though in the context of something that is fertile; or it could mean "chaste, eloquent" or "excellent language" referring to a good speech or words.