Kleijn
Kleijn is a Dutch surname meaning "small". The ij digraph is often replaced with a "y". Notable people with the surname include:
- Arvid de Kleijn, Dutch racing cyclist
- Eelke Kleijn, Dutch producer and DJ
- Jetty Kleijn, Dutch computer scientist
- Pieter Rudolph Kleijn, Dutch landscape painter, son of Antoinette Kleijn-Ockerse