The Russian word for town is gorod (город in Cyrillic), which also appears as grad (грaд) in the names of towns - Volgograd, Leningrad etc. This is a cognate of the English words garden and yard (interestingly, the Russian for kitchen garden is ogorod, or огород). The OED thinks that the Russian words are borrowings from an old Germanic root, rather than a separate development. The proto-Germanic root *garda had the sense 'enclosure'. The earliest sense of town, when it was spelled tun, is also "an enclosed place or piece of ground" (OED). Other English words that go back ultimately to the root *garda, with its sense of 'enclosure' are girth, gird, girdle, horticulture (from Latin hortus, garden), cohort, and orchard (which may have come from a blend of hortus + yard).