It is likely that the name Blencathra is derived from the Cumbric elements *blain ‘top, summit' and cadeir ‘seat, chair', meaning ‘the summit of the seat-like mountain'. Andrew Breeze has proposed an alternative interpretation of the second element of the name, arguing that it represents a Cumbric cognate of Middle Welsh carthwr ‘working horse'. Richard Coates has suggested that the second element may be the Middle Irish personal name Carthach, but writes that ‘the implications of that with a Brittonic generic need exploring'.