This is the 6096th most frequent Dutch word.
rooij
"Rooij" is an archaic or regional variant of "rooi," meaning "clearing" (as in land cleared of trees).
Here, 'rooij' is used as an incorrect or colloquial form to denote 'red' or 'reddish', related to 'rood', whereas the correct term would be 'rood' or 'roodkleurige' in standard Dutch.
De rooij van de bomen was prachtig in de herfst.
The red color of the trees was beautiful in the autumn.
In this context, 'Rooij' functions as a proper noun, possibly derived from a location or descriptive term indicating red soil or similar.
Zijn achternaam is Rooij, wat uit een plaatsnaam afkomstig kan zijn.
His last name is Rooij, which might originate from a place name.
Here, 'Rooij' is part of a company name and may reference someone's surname or a descriptive term for the business.