Where does “Peel en Maas” come from?

Peel en Maas (English) comes from Dutch Peel en Maas, from Dutch Maas, from Middle Dutch Mase, from Old Dutch Masa, from Proto-Germanic Masō, from Proto-Celtic Mosā.

Ancestry of “Peel en Maas”, step by step

StepLanguageWordMeaning
1DutchPeel en Maas—
2DutchMaasMeuse
3Middle DutchMase—
4Old DutchMasaMeuse
5Proto-GermanicMasōMeuse
6Proto-CelticMosā—
Every word from Proto-Celtic Mosā →Every word from Proto-Germanic Masō →Every word from Old Dutch Masa →