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Derived from Latin firmatus meaning "firmed, strengthened", itself a derivative of firmus "firm, strong, enduring, stable" (making it a cognate of FIRMINUS; also compare Firmus). This was borne by Firmatus the deacon, an obscure early Christian martyr. It was also borne by Saint William Firmatus (c. 1095-1103), a Norman hermit and pilgrim from Tours (known in Guillaume Firmat in French).