From Wiktionary, the free dictionary
Attested as Ooster Aa in 1680, originally a hydronym. From ooster- (“eastern”) + aa (“watercourse, river”).
Ooster Ee n
- A neighbourhood of Waterland, North Holland, Netherlands
- van Berkel, Gerard, Samplonius, Kees (2018) “ooster ee”, in Nederlandse plaatsnamen verklaard[1] (in Dutch), Mijnbestseller.nl, →ISBN