I'm adding some Anglo-Norman descendants to the Frankish roots, and I was wondering, how many variants do I add, because Anglo-Norman had *a lot* of variation?
I don't really know. You should probably ask an Anglo-Norman editor.
To expand upon CodeCat's comment: User:Mglovesfun is our resident Anglo-Norman editor, currently the only one according to Category:User xno. My thought would be: include the most common variant or two, and if another form shows the Frankish derivation particularly well, include it, too.