*Oppose. I would prefer Isco but my understanding is that we can't simply move to Isco as that's indistinguishable from ISCO when readers try typing it into the search box. Therefore, we have a choice between Isco (footballer) and Francisco Román Alarcón. "Isco (footballer)" doesn't actually pass WP:UCN; readers won't type that string into the search box and it's not used in sources because it includes a bracketed suffix of wikipedia's own invention. Wikipedia:Article titles favours natural disambiguation over such artifices; in this case we have a perfectly good natural disambiguation - his real name. I am very surprised by the suggestion that a name which does not appear in any of the sources is the WP:COMMONNAME.