Yepp, it is a variant of
Natasha.
Pronounced almost the same way... in Polish the "sh" sound isn't spelled "sh", the "sh" sound is spelled by "si" or an "s" with an accent (a line) over it... the "sz" sound is close to the "sh" sound but a bit harsher, there is no such sound in the English langauge.
I'm trying not to be too confussing.