Well, it's a question of choosing between absolutism and relativism =).  In this case, I think relativism (pardon the pun) wins the day.  No one who has heard of the father will not have heard of the son; no one who not heard of the father will be looking for his page (still nonexistent). We can always add a disambiguation page later if anyone complains.  (In that case, I think your suggestion of making it Nabokov is correct.)  In the meantime, the policy on foreign names is in Wikipedia:Naming conventions (anglicization) and there's also a current discussion at Wikipedia_talk:Manual of Style. And, welcome to the Wikipedia.  You'll find lots of discussions like this all the time.  Your knowledge and interest will be welcome (as will your politeness).