What is "marignac"

Marignac is the name or part of the name of the following communes in France:

• Marignac, Charente-Maritime, in the Charente-Maritime department
• Marignac, Haute-Garonne, in the Haute-Garonne department
• Marignac, Tarn-et-Garonne, in the Tarn-et-Garonne department
• Marignac-en-Diois, in the Drôme department
• Marignac-Lasclares, in the Haute-Garonne department
• Marignac-Laspeyres, in the Haute-Garonne department