I've always thought of the dobro as such an Appalachian (or American at least) instrument, but these days "dobro" (=good, as in "good morning," "good evening," "I'm doing well," etc.) is such a part of my daily vocabulary in the Balkans. Today's great epiphany comes from the wonderful Encyclopedia of Appalachia, which explains that in fact the dobro was invented by two brothers from Slovakia. Further investigation reveals that an early motto for the Dobro company was "Dobro means good in any language!" Dobro da znam.