Named for Thomas Wynne, William Penn's physician. When the Pennsylvania Railroad line expanded to 4 tracks in 1879, it was extended beyond the tracks through an underpass.
Victoria Donohoe:
Already a public road by 1871, N. Wynnewood Avenue is older than East Wynnewood Road, which was created and confirmed in 1878. The two roads were not connected until a railroad underpass was built at Narberth in 1879, replacing a former railroad crossing of the old Haverford and Merion Road, now Haverford Avenue, midway between the tunnel and the Wynnewood railroad station.