How do you translate English names to spanish?

The easiest way to do it would be to look it up online. google the name you want and see if it has a Spanish translation. There are some obvious names that do have quick translations:

Ricardo = Richard

Alejandro = Alexander (Alex)

Josué = Joshua

Juan = John

Marco = Marcus

Mateo = Matthew

Eduardo = Edward

Pedro = Peter

There are many common English names though that do not have Spanish translations. The only thing that changes across the languages would be pronunciation. Like the name "Kathy" does not exist in the Spanish language because the 'h' is a silent letter. So in spoken Spanish, it would be pronounced "Katty" instead.