Nothing, it is just the stage name of Jean-Baptiste
Poquelin.
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Moliere's real name was Jean-Baptiste Poquelin. He was a French playwright and actor who is considered one of the greatest masters of comedy in Western literature.
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Moliere is the stage name of the 15th century French playwright,
Jean-Baptiste Poquelin. He was hailed as one of the great comedy
writers in Western literature.
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It appears that Molière decided to change his name from
Jean-Baptiste Poquelin when he became involved with the Illustre
Théâtre, around 1643.
(http://www.imagi-nation.com/moonstruck/clsc35.html)
(http://www.2020site.org/moliere/theatre.html)