In
France, Nadil is used among people from Muslim/North African origin:
Nadil Golic (
http://echiquier.armagnac.free.fr/interne_details.html)
Nadil Aazizou (
http://accloyes.chez-alice.fr/resultsaisencou/saisonhiver/poussin.htm)
Nadil Menad (
http://forceathlet.chez-alice.fr/2emepas2004.htm)
Nadil Terbeche (
http://unss62.org/20062007/08apsa/cross/tour1/centre_lievin/indiv/pri_bg03.htm)
Nadil Cheded (
http://www.kms.fr/Eprv/Rsl/02/Rsl-VisuEprv-02.Asp?Param=La-Mediterraneenne&Param=MedMar02.Dbf&Param=10Km&Param=Marignane)
Etc.
And also in Switzerland, because there is a legal disposition refered to Nadil:
"[177]
Art. 69 al. 2 OEC – Obligation de rajouter un deuxième prénom au prénom «Nadil». 1994 / 357"
(
www.fr.ch/ofl/rfj/squinq/sq92_96_jur.doc)
Perhaps Nadil is an Arabic name basically used, as first name, in North
Africa areas (Morocco, Algeria), which are also not English speaking but French speaking areas, and the sources that you are using are in English.
Lumia
http://onomastica.mailcatala.com