I would say that it is derived from the Latin adjective
roseus "pink, rosy, rose-coloured", or otherwise derived from the Latin masculine name
Rosius:
http://www.behindthename.com/submit/name/rosius
All in all, you're not far off in your assumption that it is related to the name
Rose. :)
"How do you pick up the threads of an old life? How do you go on... when in your heart you begin to understand... there is no going back? There are some things that time cannot mend... some hurts that go too deep... that have taken hold." ~
Frodo Baggins
This message was edited 1/11/2011, 12:06 PM