Whenever I hear the name 'Rea' I think of one of these:
http://www.cassioburyfarm.co.uk/wp-content/uploads/2015/06/rhea.jpg
(Yes, I know that the spelling is different but they sound the same).
I'm not sure that's the best image to conjure up in someone's mind when they hear the name of a person!
'Rea Alanna' also shouts 'Essex Girl!" to me. i.e. I might expect to see someone with that name featured on TOWIE but I'd think it unlikely that a candidate for the Governorship of the Bank of England would have such a name (unless, possibly, they were American).
I've met plenty of Oscars in my life - but every one of them has been canine! i.e. 'Oscar' sounds a bit like 'Fido' to me ;-)