Where does “Zentralvietnam” come from?

Zentralvietnam (German) comes from German zentral, from Latin centrālis, from Latin centrum, from Ancient Greek κέντρον, from Proto-Hellenic *kéntron, from Proto-Indo-European *ḱéntrom — pointed tool.

Ancestry of “Zentralvietnam”, step by step

Zentralvietnam traces back through two separate lines of ancestry.

via German zentral

StepLanguageWordMeaning
1Germanzentralcentral; centrally
2Latincentrāliscentral, in the middle
3Latincentrumcenter
4Ancient GreekκέντρονSomething with a sharp point: point, spike, spur;...
5Proto-Hellenic*kéntron—
6Proto-Indo-European*ḱéntrompointed tool

via German Vietnam

StepLanguageWordMeaning
1GermanVietnamVietnam
2VietnameseViệt NamVietnamese
3VietnameseNam ViệtNanyue
4Middle Chinese南—
Every word from Proto-Indo-European *ḱéntrom →Every word from Proto-Hellenic *kéntron →Every word from Ancient Greek κέντρον →