Where does “Đoan” come from?

Đoan (Vietnamese) comes from French douane, from Middle French doane, from Medieval Latin doana, from Andalusian Arabic duwān, from Arabic دِيوَان, from Persian دیوان, from Middle Persian dywʾn', from Middle Persian diβi-vān — tablet; cylinder seal, sealed tablet.

Ancestry of “Đoan”, step by step

Đoan traces back through two separate lines of ancestry.

via French douane

StepLanguageWordMeaning
1Frenchdouanecustoms; customs office
2Middle Frenchdoane
3Medieval LatindoanaA customs duty
4Andalusian Arabicduwān
5Arabicدِيوَانadministrative office; register
6Persianدیوانdivan; bureau; court, tribunal
7Middle Persiandywʾn'archive; collected writings
8Middle Persiandiβi-vān
9Middle Persiandipi-vān-relating to documents
10Old Persiandipi-vahanamdocument house
11Old Persian𐎮𐎡𐎱𐎡inscription; document
12Elamite𒁾inscription, writing
13Akkadian𒁾tablet; document; letter
14Sumerian𒁾tablet; cylinder seal, sealed tablet

via Chinese

StepLanguageWordMeaning
1Chinese
Every word from Sumerian 𒁾Every word from Akkadian 𒁾Every word from Elamite 𒁾
Đoan — Etymology, Origin & Word History | Etymology Explorer