Grover Cleveland
You may not know anyone named Grover, but you'd be mistaken if you thought this 22nd (and 24th) president didn't influence parents across the country to name their children Grover at some point. For one thing, Grover wasn't even a first name until the president arrived. Actually, it wasn't even his first name! Stephen Cleveland was named by his parents after a popular minister named Stephen Glover. The future president adopted the first name Grover as a nickname, which became popular in America after he became president.
One notable example of how the name spread in American homes is Hall of Fame baseball player Grover Cleveland Alexander, who was born while the president was in office. Grover has been the name of numerous American politicians, as well as famous athletes, entertainers, and, of course, one notable blue puppet.