In real life, I've met/known:
RikuRoope
Raija
Raili
RaisaRauni
RebekkaReeta /
ReettaReija
RiinaRiittaRitaRonjaRoosa
I guess that feminine R names are quite popular in Finland...
I could use:
Ramona - as a MN
Ruth /
Ruut
Rafael /
Raphael - as a MN
Robert - as a MN
Roland - as a MN