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From or of "Reyhan". Comes from the word "Reyhan", an Indian Sanscrit noun for a type of edible plant/vegetable containing strong favourable aroma and taste and used as appetizer in an area of the same name currently inside western India but previously belonging to the persian empire. Arab traders took samples and then seeds to the Arabian penninsula.

The addition of the "EH" suffix creates a feminine association, and therefore a female name.
by Anthrolinguist July 31, 2011