Actually, Ffion is the name for foxglove but it's based on the Gaelic element fionn meaning 'teg, gwyn' or for those who don't speak Welsh as well as you inevitably do, 'fair, white'. Fiona is actually a Latinised version of that same element, not Irish but Scottish, first used by Macpherson in his Ossianic poems. So the base roots of both Fiona and Ffion are the same Gaelic ffion for 'fair, white'.
There is an Irish name, Fíona which means 'vine' and is unconnected to the Scottish Fiona but that's a story for another day...
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