Where does “Flandrynish” come from?

Flandrynish (Manx) comes from Manx Flandyryn, from Dutch Vlaanderen, from Middle Dutch vlaendren, from Old Dutch flāmdra-, from Old Frisian flāmdra-, from Proto-Germanic flaumaz, from Proto-Indo-European plew- — to fly, flow, run.

Ancestry of “Flandrynish”, step by step

StepLanguageWordMeaning
1ManxFlandyrynFlanders
2DutchVlaanderen—
3Middle DutchvlaendrenFlanders
4Old Dutchflāmdra-—
5Old Frisianflāmdra-—
6Proto-Germanicflaumazstream; current; flood; eddy
7Proto-Indo-Europeanplew-to fly, flow, run
Every word from Proto-Indo-European plew- →Every word from Proto-Germanic flaumaz →Every word from Old Dutch flāmdra- →