Belisama was a Celtic goddess, who was associated with Minerva.
The name also appears in various river names of Gaul and Britain, including Belisama (River Ribble) and Le Blima (Tarn). The attestation of the theonym as a river name may indicate that she was a lake- and river-goddess. Belisama has also been speculatively claimed as companion of Belenos, whose name seems to contain the same root.
Digital Maps of the Ancient World 