Riin

Riin is an Estonian feminine name functioning as a short form of Katariina, the Estonian adaptation of the Late Latin Caterina, itself derived from the Greek name Aikaterine, whose meaning remains debated but is often associated with the Greek word katharos, meaning pure. The name has been in use in Estonia as an independent given name alongside its longer form. Katariina and Karin are closely related forms within the same name family.