The three volumes of NPAG are referenced in the works of Ernest Nègre Toponymie générale de la France (volume 1, 1990).
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One example are the forms ending with -acum, the name forms with a proprietary name, one example includes the name *Stirpius (derived from *Stirpiacum in which is the etymology of Étréchy) with the explication: The name of a person comes from stirps, souche in French; from E. Nègre (TGF § 6359).
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