Just looking at the ENAMDICT, it looks like it would have to be a full name, Takina Sawa 多希奈 さわ
Unfortunately, the unique part - 'Takina' - would be a given name. Of course, it's only unique in ENAMDICT. Names aren't limited to what's in the dictionary, certainly not to a dictionary by and for English learners of Japanese.
If the family name is in fact 'Sawa' it has a multitude of kanji spellings.