Tom Bombadil
#630
I guess, -u is just the number suffix of one case: nominative. What about the others? I never read anything about them. Wherever I read, there were just examples of the -t forms. Are there known precedents of the -u forms too (except nominative of course)?
If I had to guess, I would say that it is like this:
Nominative: -u
Accusative: -ú (old) / -u (modern)
Ablative: -ullo
Genitive: -uron/-uo (?)
Allative: -unna
Dative: -un
Locative: -usse
Respective: -us
Instrumental: -unen
Possessive sg: -uva
Possessive pl: -uve
But that's just a modest guess. What do you think?