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Allomorphy (Score:1)
il- im- in- ir- and ig- are almost certainly variants on the same prefix. I think the base is in-, and it varies depending on the root that follows. The 'g' in ig- doesn't strike me as a natural phonological change, so it might be a hang-over from an older language, like the silent 'k' in 'know'.
Ah, my guess is right. See allomorphy in English [udel.edu] (pretty far down on the page, under "Allomorphy"), the etymology of ignoble [m-w.com], and a definition of allomorph [sil.org].
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