Upvote:4
This is unlikely to present a problem.
- The passport and driving licence have nearly identical names and matching photos, which offers strong proof that you have the right to drive in Spain.
- The fact that names can be translated differently into English is fairly well known. And if anyone raises this as a concern you can argue convincingly that the names are not actually different, only the translation is different.
- The person reviewing this will be a low-level employee at the rental car desk, who, in my experience, is unlikely to be a stickler about these sorts of things. They will probably just dutifully copy your documents without noticing or caring about the discrepancy.
However, if you want to be completely sure, contact the rental company in question.
I'm not sure which name would be better to enter on the application. It may be best to choose the drivers' licence, as suggested by a commenter, but I don't have any real basis for that. I would perhaps choose based on the proximity to other information when filling out the online form.