Where does “Oostzaan” come from?

Oostzaan (Dutch) comes from Dutch zaan, from Middle Dutch saen, from Old Dutch sān, from Proto-West Germanic sān(ō), from Proto-Germanic sēna, from Proto-Germanic *sa, from Proto-Austronesian *əsa, from Proto-Oceanic *isa.

Ancestry of “Oostzaan”, step by step

Oostzaan traces back through two separate lines of ancestry.

via Dutch zaan

StepLanguageWordMeaning
1Dutchzaansoon; cream
2Middle Dutchsaenquickly, soon; immediately, right away; suddenly,...
3Old Dutchsān—
4Proto-West Germanicsān(ō)immediately
5Proto-Germanicsēna—
6Proto-Germanic*sa—
7Proto-Austronesian*əsa—
8Proto-Oceanic*isa—

via Middle Dutch oest

StepLanguageWordMeaning
1Middle Dutchoest—
2Old FrenchaoustAugust
3Vulgar Latinagustus—
4LatinAugustusvenerable
5Proto-Indo-Europeanh₂ewg-to increase, to enlarge
6Proto-Indo-Europeanh₂weg-to increase, to enlarge
7Proto-Indo-Europeanh₂ug-—

Words derived from “Oostzaan”

Every word from Proto-Oceanic *isa →Every word from Proto-Austronesian *əsa →Every word from Proto-Germanic *sa →