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I know both a Rhiannon and a Rhian. The rather posh, very Welsh, and highly opinionated Rhiannon is extremely proud of her acient and beautiful name, and I think it beats Rhian hands down. Rhian easly becomes lost in a sea of similar names such as Leanne, but Rhiannon always stands out.
If you use Rhiannon, there is still the possibility of using Rhian as a nn - so that's what I'd choose.