If you trust gpt4 enough then it answered yes:

The suffix “grad” in Russian city names like “Leningrad” and “Stalingrad” comes from the Old East Slavic word “градъ” (grad) which means “city” or “town.” In the modern Russian language, “город” (gorod) is the term for “city.” The use of “grad” in city names is a historical and traditional feature.