I only know the Bois D’arc colloquialism as I have been there. The others, who knows.
Versailles is “ver-sales”, Laquey is “lake-way” and Gravois is “grav-is”.
Mexico, however is mexico....
In St. Louis, Gravois is grav-oy, like Illinois. I had forgotten about Versailles but you have reminded me, and haven’t heard of Laquey.