I just noticed in some episodes the soda shop is named Robert's Place (on the front window) At what point did it change or was it originally that and then changed to Rob's place? Don't think it was ever explained.

To be honest, I never noticed that.

Raj and Shirley join together and go halfsies on Rob's Place, and this became one of the main scenes of "What's Happening Now!!"

I think it was called Roberts Place in the first or second episode of season one. From then on it was simply called Robs Place.

weird.... I don't ever remember it being called ROBERT'S place