It is usually seen as a feminine form of Richard, and it is in these terms that it's been commonly given as a name, specially for daughters of men named Richard. (Sources shared in private). [noted -ed]
― Anonymous User 10/20/2024, edited 10/24/2024
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The name Richelle was given to 43 baby girls born in the US in 2012.
This name is also frequently used in The Netherlands, where it had over 800 bearers in 2010 (in total, i.e. of all ages). I myself once had a classmate with this name.