Some common nicknames are Jola and Jolka, also Jolcia, Joleczka. This name is quite popular among women born in the 40's-60's, perhaps early seventies, but is rather dated now, I know one Jolanta (Jola) who was born in the early 90's though, and I know one toddler with the middle name Jolanta, but the latter is after a relative, but overall it seems to be out of favour nowadays. Last year there were 25 girls born who were given this name. You can call it vintage I guess. :D Although for some people it has a bit of a comedic feel, don't know exactly why really, although I myself can't say I like it.