Who are the four queens in the playing cards supposed to be?

The queens are Pallas (warrior goddess; equivalent to the Greek Athena or Roman minerva), Rachel (biblical mother of Joseph), Argine (the origin of which is obscure), and Judith (of the Apocrypha).

http://www.edinformatics.com/inventions_inventors/playing_cards.htm

The French playing cards are:

Queen of Spades: Athena
Queen of Hearts: Judith (Biblical figure)
Queen of Diamonds: Rachel (Biblical figure)
Queen of Clubs: Argine (an anagram of Regina, Latin for "queen")

In the standard English playing card deck, the Queen and the other face cards represent no one in particular, although legend states the Queen of Hearts is a representation of Elizabeth of York, queen consort of Henry VII of England. Certainly the headdress the queen wears under her crown is of the Early Tudor era.

https://en.wikipedia.org/wiki/Queen_(playing_card)

At the very end of this snopes article (last paragraph) it clearly states that no playing cards represent any real life individual.

http://www.snopes.com/history/world/cardking.asp