"of, found in, or pertaining to the Black Sea," 1550s, from Latin Ponticus, from Greek Pontikos, from Pontos "the Black Sea and the regions around it," literally "the sea," from a variant of the PIE root *pent- "to tread, go" that also produced Latin pons (genitive pontis) "bridge, passage;" see find (v.).
also over-run, Middle English overrennen, from Old English oferyrnan "to run across, pass over;" see over- + run (v.). Meaning "continue beyond a specified time" is from early 14c. Meaning "to ravage (a land), maraud, plunder" is by mid-14c. Of weeds, etc., "to grow over, cover all over," by 1660s. The noun meaning "excess expenditure over budget" is from 1956. Related: Overran; overrunning.
"an exchange, a mart," by 1869, a reference to the famous Ponte de Rialto of Venice and the market or exchange that stood on the east end of it and eventually expanded to cover the bridge itself. The name is contracted from Rivoalto and named for the canal (Latin rivus altus "deep stream") which it crosses.