The name refers to a crossing of Millwall Dock nearby: Glengall Bridge.
The bridge over Millwall Inner Dock takes its name from Glengall Grove, an old road that crossed the dock by a bridge at the same spot; the dock itself opened in 1868. The station opened as Crossharbour in 1987 on the site of the old Millwall Docks station. From 1994 it was Crossharbour and London Arena, until the arena was demolished in 2006.