I named my niece Mumtahina but people say it is not good for the baby. Please guide us more if it is an appropriate name for the baby or not.
First, note that the sura of the Quran is named Mumtahana, not Mumtahina. Mumtahana means “the woman who was tested” while Mumtahina means “a woman who tests [others].”
If you knowingly chose Mumtahina, then the meaning of “one who tests”, “tester” is not a bad meaning. It means the person is wise and discerning.
But if you chose it thinking it was in the Quran, then this is wrong, since the Quranic name is Mumtahana. But you can still keep Mumtahina since it does not have a bad meaning.
And God knows best.
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