Probyn is a Welsh surname (from ap
Robin - son of
Robin), pronounced PROB in. It's not used as a first name in Wales.
Galbraith is a Scottish surname with many variants, of which Gailbraith is likely one.
Apparently "it originated as a nickname for a member of the Briton tribe of Strathclyde who settled amongst the Gaels in the 7th century. In Gaelic the name is written Mac galle Bhreathnach, from "mac", meaning son of, "gall", a stranger, and "Breathnach", a Briton."
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