Words with a common ancestor are known as “cognates” (Latin co- plus – gnatus) meaning “born together”. Scots neuk “corner” has an English cognate nook, but we don’t really know what their mother-form is. There is a Norwegian dialect-word nok meaning “bent with age”, but that seems rather distant, and the medieval Latin word noca “corner”, first recorded in a twelfth-century document, seems actually to be a borrowing from English. Gaelic niuc seems to be a borrowing from Scots. All very mysterious.