Does anyone have the early forms and etymologies?

You mean something like this?

quote:

I have reconstructed below what I think the month names might have been called - this list is based off of comparisons with Scottish and Manx month names. It seems to me that the year was broken down into four groups of threes: Cet "beginning," Medon "middle" and Dered "end." Imbolc, Beltene, Lugnasad and Samain wouldn't have originally been month names, but rather the names of important festivals at the beginning of Feb, May, Aug, and Nov.

FEB: Imbolc / *Cet-Errech
MAR: [*]Medon Erraich [Togail Bruidne Da Derga]
APR: *Dered-Errech
MAY: Beltene / Cetamain [<*cintu-samoni]
JUN: Mithemain [<*medio-samoni]
JUL: *Dered-Samain
AUG: Lugnasad *Cet-Fogamar
SEP: [*]Medon Fogmair [TBDD]
OCT: *Dered Fogamar
NOV: Samain / Gam (Sanas Cormaic) / *Gamain / *Cet-Gam[ain]/[rad]
DEC: *Medon-Gam[ain]/[rad]
JAN: *Dered-Gam[ain]/[rad]

(Source: https://listserv.heanet.ie/cgi-bin/wa?A2=ind0009&L=OLD-IRISH-L&D=0&P=6686; found by means of a simple Google search on "Old Irish months".)

I meant a more 'recent' etymology like in the week days, not all the way back to common celtic

So how am I supposed to understand "early forms" in your original request? (Particularly when you're incapable of distinguishing "Common Celtic" from "Old Irish".)

I didn't mean that sarcastically!

Thanks for taking the time to root them out; I appreciate it

I just wanted to see the forms evolve over time and what meaning was behind them

Now you have the meanings behind them. For a look at how they evolved over time, I suggest the Electronic Dictionary of the Irish Language. For instance, input "Meitheamh", and you'll get the earlier form mithem, genitive mithemon, dative mithemain.

Thanks, Domhnaillín