A kingdom in my setting is pretty much England + France. Now

There's this little thing called the Norman Conquest. You should probably start there.

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>>44135701
>A kingdom in my setting is pretty much England + France.
So the Angevin Empire? Battle of Bouvines best day of my life.

>Now I have problems with names. Neither fit purely English names nor French names.
You could go the Canadian route of combining French first names with English last names and vice versa. Otherwise just look up the names of the Normans and the Angevins, though you'll find that a lot of those names are distinctly French (though a lot of them were Anglofied in Anglophone history).

I guess a lot of nobles would have "last names" with a 'de' in them, so [First name] de(/of) [Geographical region]. Having an English first name and a French region in those names already goes a long way, such as... who else, William de Normandie.

French name + English sounding end maybe.
>Dufresneton
>Runeaushire
>Etienneswall
Or vice versa:
>Williamseau
>Regienne
>Johnsegne

>>44135859
>William de Normandie.

William = Guillame (itself derived from the Frankish Wilhelm)

Jon de Rose
Sebastian de Labrador
Nigel de Lancie
Genevieve Dupound
Gilles O'Can

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>>44136079

>>44136079
No. Just, no.

The modern (and Middle) English language is already a hybrid of Norman-French and Old English, so many of what you think of as being pure English names really aren't. For proper English names, look at the Rohirrim in LotR. Place names tended to remain unchanged, though. For OP's setting, just look up the names of aristocrats following the Norman conquest.

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http://pastebin.com/2wM2DRQf

Here's a thousand words that mash up the English and French names from CK2

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>>44139208
>A THOUSAND WORDS
That's a lot of effort to put into one guy's thread, bruh.

>>44135701
I know it's already been said, but loads of English folk have French derived names. Search googl for "Norman surnames" (I found some good lists right away). French derived given name + french derived surname = vaguely french (but still sorta english sounding) name.