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Someone more knowledgeable should respond, but there is an Arabic root nasuh which means something like sincerity (often found in the religious context taubat-an-nasuha meaning sincere return or repentance, especially in reference to 66:8 of the holy book). Since names of Arabic origin are popular in many Islamic cultures, this could be related to the name you are searching.

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Take all this with a lump of salt: I have no knowledge either of Islam, Arabic or this name.