Maribel

Maribel is definitely not a typical Polish name, nevertheless, as of January this year, there have been 17 Maribels in Poland.
I guess a Polish Maribel could use the same nicknames as either Maria (Marysia, Maja, Mania etc. ) or some that would work for Isabel (Belunia, Belcia etc.). Maribelka also could be a possibility. A Maribel's Polish name day could also be either together with Maria (January 23, February 2, February 11, March 25, April 9, April 26, May 3, May 27, May 29, June 27, July 2, July 16, July 22, August 2, August 5, August 15, August 22, August 26, September 8, September 12, September 15, October 7, November 16, November 21 and December 8) or Isabel (February 23, March 16, August 31 and September 3).

The name Maribel was given to 182 baby girls born in the US in 2012.