Hi Matt. My sisters Patron Saint… is St. Clare of Assisi. We live in the U.S., but it’s probably the same spelling in other english speaking nations. I believe “Clara” is simply the latin spelling of the name. I’ve seen holy cards of St. Clare of Assisi… with the latin inscription… “Sancta Clara”. And in California… where I come from… there is the city of Santa Clara. To the best of my knowledge, they all refer to St. Clare of Assisi. Not sure about the spelling “Clair”… which I haven’t seen. Maybe someone else will comment on that spelling.
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