Perez
Improved:
You can't really pick one to be a "popular" last name, there is a whole lot of Abreu, Vargas, Castillo, Cruz, Marte, and other spanish last names. There are alot of uncommon ones as well, but you tend to meet many typical spanish surnames.
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The most popular name right now in Puerto Rico is mike. The family of mike rotch is very popular in puerto rico so mike started to become extremely popular.