Rhys
[ris]Meaning
From Old Welsh Ris, probably meaning "ardour, enthusiasm"
Background Story
Rhys is a Welsh given name, usually male, that is also used as a surname. It comes from Old Welsh Ris, probably meaning "ardour, enthusiasm", and originates from Deheubarth in South West Wales. It is pronounced [r̥ɨːs] in North Wales, [r̥iːs] in South Wales, and REESS in English, and its anglicised forms include Reece, Rees, Reese and Rice.
Temperament

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Rion
Not documented as having a meaning in the sources checked