Claron is a variant of Clarence, which means 'clear, bright' and which is mostly used as a male name, although i know that it is used on women too (Clarence, i mean)
Costagliola is an Italian surname and it is highly unlikely to be used as a firstname.
Jantine i have already answered in the previous post.
Oranel is a boys name and it comes from the ancient Italian name Oranello. The female forms are Oranelle and Oranella. The name is very old and i couldn't find a meaning of it, but the once existence of the name still can be found in the surname Oranelli, which means 'son of Oranello'.
Tercero is, like Andy said, Spanish for 'third' and it is a masculine name. You can find in the database of this site, just follow the hyperlink.