Bobruisk
From Memory Alpha, the free Star Trek reference
Bobruisk is an Earth city located in the European Alliance.
In the 24th century it was the site of Earth Station Bobruisk, the location from which Sergey and Helena Rozhenko beamed aboard the USS Enterprise-D in 2367. (TNG: "Family")
As Worf's parents beamed up from this location, it is possible that they lived in the vicinity of Bobruisk.
