There are craters on the moon and Mars named for Newton.
In Star Trek, there was a starship named the U.S.S. Newton. It was also the name of that particular class of vessel.
In the Harry Potter universe, Professor Newton Artemis Fido "Newt" Scamander was the author of the textbook, Fantastic Beasts and Where to Find Them. J.K. Rowling wrote a real version of the book for charity.
Newton is an English name that means 'New town'. Newton appeared in SSA's top 1,000 names in the U.S. from 1880-1957. It's highest rank was in 1880 at #182. In 2011, only 14 boys were named Newton. I love this name, and the cool nickname "Newt", but it as been totally ruined for me by a distasteful American politician.