From Danish måned (“month”), from Old Danish maanædh, from Old Norse mánuðr, mónuðr, mánaðr (“month”), from Proto-Germanic *mēnōþs (“month”), from Proto-Indo-European *mḗh₁n̥s (“moon, month”), from earlier *méh₁n̥ss, from *meh₁- (“to measure”). Doublet of måne.