Liverpool

English city on the River Mersey, c.1190, Liuerpul "Pool with Muddy Water," from Old English lifer "thick, clotted water" + pol (see pool (n.1)). "The original reference was to a pool or tidal creek now filled up into which two streams drained" [Victor Watts, "Cambridge Dictionary of English Place-Names," 2004]. The adjective and noun Liverpudlian (with jocular substitution of puddle for pool) is attested from 1833.