Now you know B.J. Upton's real name, but can you guess these other Major Leaguers'?

On Sunday, MLB.com's Mark Bowman reported that B.J. Upton's uniform would look a little different this year:

B.J. Upton will go by the name Melvin Upton Jr. this year. Upton will explain his reasoning when he reports to #Braves camp.

- Mark Bowman (@mlbbowman) February 22, 2015

B.J. stood for "Bossman Junior," which, shockingly, is not the center fielder's real name (not every parent can be Frank Zappa). "Bossman" was his father's nickname and we're assuming you can figure out the "Junior" bit.

But Upton isn't the only MLB-er who's changed his name. Mouse over the pictures below to see which players go by something other than what's written on their birth certificates, and see how many you know: 

Perhaps that last one isn't entirely accurate, but you have to admit it would look great on the back of a jersey.