The first Rico was Rico Dredd. Rather annoyingly, some writers and artists have appeared to think that Rico is his surname, which defeats Pat Mills's purpose in creating the character: he's Joe Dredd's brother. They would have the same surname.
The second Rico was originally just called Dredd, with no first name. At the end of his first story, he changed it to Rico, which is his surname (and as far as we know, his only name. Unless he kept Dredd as a first name. Making him Dredd Rico. But probably not).
The second Rico was originally just called Dredd, with no first name. At the end of his first story, he changed it to Rico, which is his surname (and as far as we know, his only name. Unless he kept Dredd as a first name. Making him Dredd Rico. But probably not).