Adam doesn’t have any nicknames, really, but if you want to add a bunch of “h’s” you can alter it into the Irish spelling, Ádhamh.
Famous people named Adam:
Biblical first man on earth, Adam; actors Adam Sandler, Adam Brody, Adam DeVine, Adam Scott, and Adam Wiley; singer Adam Levine.
The Beast in Disney’s Beauty and the Beast is actually Prince Adam.
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