perambulator (n.)

"walk through, about, or over," 1560s, from Latin perambulatus, past participle of perambulare "to walk through, go through, ramble through," from per "through" (from PIE root *per- (1) "forward," hence "through") + ambulare "to walk, go about" (see amble (v.)). Related: Perambulated; perambulating.

"baby carriage," 1881, a colloquial shortening of perambulator, perhaps influenced by pram "flat-bottomed boat" (1540s), especially a type used in Baltic ports for loading and unloading merchant vessels, from Old Norse pramr, from Balto-Slavic (compare Polish prom, Russian poromu "ferryboat," Czech pram "raft"), from PIE *pro-, from root *per- (1) "forward," hence "in front of, toward, through."