Dornroschen ( sorry I can't work out how to do
The umlaut above the 'o' ) was a prettified version by the brothers Grimm of an Italian fairytale called 'sun, moon and Talia' by Giambattista Basile in the 16th century.
The Italian original version was as the pp has said but it isn't the story that the Grimm brothers re-wrote.
I think Briar - Rose is beautiful fwiw, Briar on its own sounds like a nature name ( Rowan, Juniper etc ) and I think it's quite pretty too.
The connotations of being grumpy from Ireland won't be made so much here ( unless you are Irish ) so use it if it makes you happy.