Rey Mysterio recently filed a trademark for "Principe Mysterio," which translates to "Prince Mysterio."
This appears to be the name for his 21-year-old son Dominic, who has been training at Lance Storm's wrestling school in Calgary, Canada.
Last month, Mysterio registered the following trademarks for merchandise purposes:
"Greatest Mask of All Time"
There was also a variation of "G.M.O.A.T." trademarked with the Mysterio mask replacing the letter M.