Ok, I get it lol
No, I don’t think parents (grandparents) should coerce or pressure their children to choose any name they don’t absolutely love. [name_m]Even[/name_m] telling them “you can choose any name that means wolf” is severely limiting. If this is just a fun thing you & your sister want to do when naming your kids, thats your decision, but don’t expect your children to follow suit. You wouldn’t be happy if your parents or in-laws tried to put restrictions on you when naming your children. [name_m]Don[/name_m]'t be ‘those people’.
lol I suppose you’re right. It’s fun to dream, though 
You get your chance to names your kids but you don’t have the right or ability to dictate what futu generations choose. [name_f]One[/name_f] of your children’s spouses am have a name they have always love or a family name they want to use… why should they be constrained by what you and your sister decided years earlier?
I don’t believe in family naming requirements. I think they are limiting and controlling of something that should be fun, unique, and special to each family!
There’s no way to enforce it, if you do it in a pressuring way you’ll turn them off it. If you do it in a fun loving way and they like it, they’ll do it without you telling them its a rule or pushing them to do the same.
I would just tell them the story when they’re little about how you chose wolf/fire and what it meant to you and see where they go with it. They might do what you have in mind, they might “flip” it (daughter with a fire name might want a son with a fire name) or they might just appreciate how you enjoyed the imagery and magic and do something similar-but-different (water? eagles? Who knows…) for their kids, or just enjoy their own fiery name but let their spouse name after a beloved grandma.
It’s all good.