Welcome to the Gronovius family tree. 
The Gronovius name is written in different ways: Van Gronau, Gro(e)nou, Gronow, Gronau, Gronauw, untill Johann Frederich (1611-1671) changed the name into latin making it Gronovius. A lot of the information is based on an article by Bijleveld in the "Nederlandsche Leeuw 1942" and other sources from the web. According to research by Tito Gronow, a Finnish branch took the  name - Orjala meaning slave. One (Protestant) son felt himself as a slave of God and changed his name to Orjala.