The standard Polish form of this name is Gryzelda, but Griselda has also been in use occasionally. As of January this year, there have been 12 women with this first name in Poland. Other 2 have it as their middle name.
Griselda, of course, has not come into high demand as of late. Aside from its similarity to the words "grizzled" and "gristled," this can be blamed on the Monkee's "Your Auntie Grizelda."