I love
Sienna and
Vivienne (this spelling), but not together. It's too rhymey as a combo, imo - they both have the EE next to the EN in the pronunciation. How about
Sienna Victoria?
Rate my PNLs!Potential character names: https://www.behindthename.com/pnl/148673Names I've used: https://www.behindthename.com/pnl/148673/139859