Of course you can change the name. Otherwise, it would be a pretty limited sell, wouldn't it? When a kit uses lettering, an alphabet chart usually comes with the instructions. Just make sure to center the name.

This is a very cute birth announcement. The kit includes 14ct. light blue Aida cloth to do counted cross stitching. It also includes thread, needle, instructions, and a chart so you can add the name and date that you want. The finished size is 12 inches x 12 inches. It will be a beautiful picture for your grandson.