How do you pronounce Roronoa's name?
The pronunciation of the hiragana character ろ is the correct way to pronounce the ro in Roronoa Zoro's name. This pronunciation lies somewhere in between the English pronunciations of Ro and Lo (though closer to Ro). You can find an audio file with the pronunciation on this page at guidetojapanese.org.

The canonical Roman spelling for his name is Roronoa Zoro, since this is the spelling used on his bounty poster. In the English dub, 4kids changed his name to Zolo for some reason. 



His first name is Zoro, and last name is Roronoa. The Japanese place their family name before their first name.