However, here are some options that might be considered:
* "Savana": This is the closest phonetic translation and is a common word in Portuguese meaning "savanna," the biome.
* "Sabrina": This is a common Portuguese name that sounds similar to Savannah.
* "Sofia": This name is popular in Portugal and shares a similar feel with Savannah.
* "Savanha": This is a less common but possible spelling that is closer to the English pronunciation.
Ultimately, the best way to choose a Portuguese name for Savannah would be to consider the specific context and desired meaning. You could also try to find a name that shares the same initials or a similar feeling.