The Proto-Indo-European word *méh₁-nōt
Word *méh₁-nōt
Meaning moon, month
See also Linear B: me-no ‘month’
Proto-Indo-European: *med- ‘weigh, to measure’
Tocharian B: meñe ‘moon’
Sanskrit: mā́sa ‘moon’
Avestan: māh- ‘moon’
Synonyms *(s)kand-, *louksnehₐ-

Comments
Gk. mēn, Toch. mañ/meñe, Lat. mēnsis, Eng. mōna/moon, OCS meseci, Polish miesiąc, Russ. mesjac, Skr. māsa, Arm. amis, Av. maoṅ h, Ir. mí/mí, ON mani, Gm. mano/Mond, Goth. mena, Alb. muaj, Lith. mėnuo, Ltv. meness, Welsh mis, Kamviri mos, Pers. /māh, Osset. mæj, Old Prussian menig, Kurd. mang

Other words that might be of interest
*ĝheim- ‘snow, winter’, *h₂stḗr ‘star’, *nebʰ-o-, nebʰ-i- ‘cloud’, *sneigʷh- ‘snow’, *sneudh- ‘cloud, mist’, *séhₐul ‘sun’, *h₃meigh- ‘drizzle, mist’, *nébʰes- ‘mist, cloud, sky’