The name Sanne is a girl's name of Dutch origin meaning "lily". Sanne and is often added to lists like Cool Girl Names From Around the World and discussed in our forums with posts like "Boy and girl makeover with middles".
From the experts:
Sanne is hugely popular in the Netherlands, but almost unknown here — which makes it an interesting prospect for the parent in search of an unusual name. Pronounced sah-na, Sanne is in keeping with the Dutch taste for nicknames plucked from the middle or end of a name vs. the beginning, such as Bas for Sebastien or Bram for Abram.