The Proto-Indo-European word *louksnehₐ-
Word *louksnehₐ-
Meaning moon
See also Proto-Indo-European: *leuk- ‘shine’
Synonyms *méh₁-nōt, *(s)kand-

Comments
Mallory J.P. and Adams D. (2006)

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’