The Latinate surname Crellius may refer to three generations of Socinian theologians:
- Johannes Crellius, Jan Crell 1590–1633, father
- Christopher Crellius, Krzysztof Crell-Spinowski (Latin: Spinovius) 1622–1680, son
- Samuel Crellius, Samuel Crell-Spinowski 1660–1747, grandson