Mav. Or Rick, but if you like that, why not just name him Rick in the first place?
Famous people named Maverick:
Pro wrestlers Maverick Wild and Maverick Matt Bentley; singer-songwriter Maverick Sabre.
The word “maverick” came into use because of Samuel Augustus Maverick, a 19th-century rancher who said (and I’m paraphrasing here) “I DO WHAT I WANT,” and refused to brand his cattle.
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