Is there a store that you can buy glasses and have it engraved

Yes

Sunglass hut

Yes There are several stores that do different types of engraving. Your can also design your own T-shirts from a wide selection of artwork and sayings I works suggest getting a directory on Disney Springs from a local hotel or information both

Yes there is

Yes there are!

I assume you mean drinking glasses and yes it's somewhere around Goofy's Candy. I believe the store you are looking for is between there and T-rex

There are stores for sunglasses but don't know if they do engraving.

Magic Kingdom!