The Oxford Names Companion, OUP "Scottish Forenames" - Donald Whyte, FGH, FSG
Notes:
Scottish, English and German from Latin "flower". Flora appeared in France in the Renaissance period from whence it was carried to Scotland and thence to England. It is used as an Anglicized version of the Gaelic Fionnaghal.
Thanks to Donald Whyte who provided much of the initial information for this site.