No literary source or inscription outside her own shrine explains what her name means or where it comes from. The name survives only as a religious dedication carved on Roman-period altars at one site, with no surrounding text to gloss it.
What would resolve this A comparative Celtic and Brittonic etymological study of the name against known place and water-deity name elements, and continued epigraphic survey in case an uninscribed or fragmentary dedication elsewhere in Roman Britain or Gaul preserves a related or explanatory form.
OpenCeltic and Brittonic historical linguistics; Romano-British epigraphyJames MacKillop, A Dictionary of Celtic Mythology