Where does “đầy tháng” come from?

đầy tháng (Vietnamese) comes from Vietnamese đay, from Vietnamese dài, from English die, from Latin die, from Latin dies, from Latin diem, from Proto-Italic djēm, from Proto-Italic *djous — to be bright; sky, heaven.

đầy tháng (Vietnamese): the celebration of a baby's first month since birth

Definitions

  1. the celebration of a baby's first month since birth

Ancestry of “đầy tháng”, step by step

đầy tháng traces back through two separate lines of ancestry.

via Vietnamese đay

StepLanguageWordMeaning
1Vietnameseđayjute (genus "Corchorus", especially the jute...
2Vietnamesedàilong, lengthy
3EnglishdieTo stop living; to become dead; to undergo death;...
4Latindieablative singular of diēs; day; before the day
5LatindiesA day, "particularly:"
6Latindiemaccusative singular of diēs
7Proto-Italicdjēmaccusative singular of *djous
8Proto-Italic*djous
9Proto-Indo-Europeandyḗwssky, heaven; sky god
10Proto-Indo-Europeandyéwssky, heaven
11Proto-Indo-Europeandyew-to be bright; sky, heaven

via Vietnamese thẳng

StepLanguageWordMeaning
1Vietnamesethẳngstraight
2Chinese
3Proto-Sino-Tibetanr-la(w)ŋsteam; hot
Every word from Proto-Indo-European dyew-Every word from Proto-Indo-European dyéwsEvery word from Proto-Indo-European dyḗws