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Etymology of Theneuille
It seems that Theneuille (and other French place names as Théneuil, e.g.) comes from the Gallic root tanno-, "kind of green oak". This root is present in Breton, tannen, "oak"; in old Irish, tinne or teine, "holly tree"; in Cornish, glastannen, "oak" or "holm oak" More information, and controversy about some related words, at:
http://monsu.desiderio.free.fr/jardin/chene.html (in French)Lumia
http://onomastica.mailcatala.com
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Thanks a lot for your help! It would also be helpful to know how both Teneuille and Tenaille, the other French surname suggested by Menke as a possible source of Tennille, are pronounced in France, to help figure out which one (if either) is the more likely source of the American surname Tennille.
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