By the linguistic phenomena of lenition and first-type anaphonesis, since 1150 also names Garbania and Garbagna began to be used, while since 1367 only the latter has remained.
This passage describes how the names Garbania and Garbagna evolved over time due to linguistic changes, specifically lenition and first-type anaphonesis. By 1367, only Garbagna remained in use.