TVER'

Before we have a look at this Russian town's name, take into account the following pairs:

კვრა [kvra] (hitting) - კვერი [kveri] (hammer or fist)

სვრა [svra] (staining) - სვერი [sveri] (village's name)

ძვრა [dzvra] (moving) - ძვერი [dzveri] (village's name)

If you agree that each of these pairs consist of cognate words, then you should agree that the word თხვრა [thvra] (making dirty) may have a similar cognate თხვერი [thveri].

Why is it important? Because the ancient name of Tver is exactly Tkhver (Тхверь), which in Kartvelian transliteration would be თხვერი [thveri].

So, if all the above makes sense, then the name of Tver' (Тверь) means 'mud' or 'muddy'. Interestingly, in Russian region of Lipetsk there is another town named Griazi ("Muds"). And totally funny is a recent post in zyalt's livejournal about Tver's muddiness.