Personally, I think it is a bit long and jumbled to say, but separately I love both names. If you like those names, maybe you could add a third name that doesn't end with an 'a' to soften it up? Still, I do like the names together :)
its coool
Katharina Dalichau's birth name is Katharina Schmaltz.
Katharina Kubrick's birth name is Bruhns, Katharina Christiane.
Katharina Magdalena's birth name is Katharina Magdalena Rettenwander.
the girl name Katharina would in my opinion should have beautiful blond hair and blue eyes.
Sienna Miller's birth name is Sienna Rose Miller.
Sienna Guillory's birth name is Sienna Tiggy Guillory.
Sienna Joseph's birth name is Sienna Isabelle Joseph-Willie.
Sienna = シエナ
The scientific or taxonomic name would be Rosa 'Katharina Zeimet'.
It comes from italy
Pedro Sienna's birth name is Pedro Prez.