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Rex is an unusual choice for a female name, as it is traditionally masculine in origin. Derived from Latin, Rex means "king" and carries a sense of authority and regality. While predominantly used for boys, some parents may choose Rex for a girl seeking a strong, commanding name with gender-neutral appeal. The name has ancient royal associations, being the Latin title for a king or monarch. As a female name, Rex remains extremely rare, offering a bold, distinctive option that breaks conventional naming patterns. It could be considered part of the trend toward traditionally masculine names being adopted for girls, similar to names like James and Ryan that have crossed gender lines in recent years.

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The name Rex is a boy's name of Latin origin meaning "king".

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Now that many dogs are named Max, it's safe to use this sleek, solid, regal name again for your child. And with the charm of its final x, its regal meaning, and its offbeat simplicity, Rex is definitely one to consider.
 Coldplay's Will Champion used it for his twin son, and Natascha McElhone gave her little boy the doubly cool appellation Rex Coltrane, and Niki Taylor — intentionally or not — gave her son the full name of the British My Fair Lady star, Rex Harrison (who was actually christened Reginald). And quite fittingly, Rex is name of a toy T-Rex in Toy Story.
 Other options: the French version Regis or the literal King.

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