According to Genesis
17:15, God changes her name from Sarai
In the (Greek) Septuagint, the change is from SARA
Some scholars take this as an argument against the common theory, that both names have the same root.
I have never heard of the meaning "contentious," as this site claims (I can't find a similar word in my Hebrew dictionaries), but maybe this interpretation follows the same idea as what I read some place: SARAI
is connected with Arabic "shara," sparkling, possibly referring to the eyes.