Benjamin Clayborne
Auror
J.R.R. Tolkien was actually John Ronald Reuel Tolkien... though I'm not sure if any other authors with double-R middle names are just imitators of him or what, so that may or may not count. ^^;
George R. R. Martin is George Raymond Richard Martin. He was born in 1948, several years before LotR came out, so I suppose his parents could have been big fans of The Hobbit... or it could just be a coincidence.
My kids have two middle names each (their middle initials are W. D. and I. L. respectively). If we'd been big fans of names starting with R, we might have gone the R. R. route for one of them.