Re: Conflicting Season Names
We have: Beltane, Lugonatos, Samon, and Imbolc, pretty much the same as your names. I'd guess any differences in spelling are due to different methods of transliteration. Maybe Ranika will stop by and give an exhaustive explanation on the subject. ~;)
Re: Conflicting Season Names
They're alternate spellings of the same names. Lugonatos is from a votive inscription in southern France near Nantes (and presumably the same as Lugnasad), and 'Samhain' is an Irish spelling of 'Samon' or 'Samonn', which also appears in votive descriptions (though it doesn't actually say the purpose of Samon; we assume it's Samhain, Samhain being a later Irish spelling). Imbolc shows up as Imbolc in Britain, so, we're pretty sure that's a common name. Samhain earlier shows up also as Samven if one literally interprets a few ogham graves (Irish spellings change drastically after Christianity arrives).