"Ll" for Llewellyn is the correct (and usual) form of Griffith's middle initial. Books listed as by F. L. Griffith or F. I. L. Griffith are simply mistranscribing the digraph Ll which in Welsh is a distinct letter.
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F. Ll Griffith is currently considered a "single author." If one or more works are by a distinct, homonymous authors, go ahead and split the author.
F. Ll Griffith is composed of 5 names. You can examine and separate out names.