I love vizslas!
Have you already got her? Is she a puppy, so hasn't got a proper name yet?
Sienna and Amber are both nice names. They go well together, which obviously isn't important as you're only getting one vizsla!
It really does depend on your dog. I have had four vizslas really in my life- I have owned five, but one male, my only male vizsla, had to be put down just two days before I was meant to take him home due to an unspotted infection, he was PTS. My female dogs were called-
- Tizsa (its a Hungarian name prounounced Tissa OR Teazer)
- Isabelline (Isabelline is a tawny kind of colour, a shade of yellowy gold but pale)
From Sienna/Amber, I'm guessing you want a name reflecting the goldeny colour which vizslas usually have, so I'd suggest Isabelline (I called her Issie or Bel- it's important to be able to shorten a name to one you'd use frequently because a one or two syllable word, like Bel/Belle or Issie, is easily recognised compared to a longer, complicated word).
Ginny? A cute name, could be short for Ginger, to reflect the kind of colour vizslas have (obviously the colour is more goldeny, but it's similar in a way).
Meg? As in Nutmeg, kinda for her colour?
Cadmium? For the colour Cadmium, which is very similar to the Vizslas' colour. Caddy maybe for short, or Mia.
Saffron