"An'amtah" (اَنْعَمْتَہْ) or "An'amta" (اَنْعَمْتَ) is an Arabic sentence meaning "you bestowed a favour". As a name, this phrase is purposeless and does not serve as a meaningful personal name. You should instead choose the name of a Sahabiyah, or any other name that carries a clear and worthy meaning.
Allah the Almighty knows best.
Darul Ifta Al-Ikhlas, Karachi.