One thing you can try is to enter the last name of the person in the Wikipedia search box in the site above (at the left, near the top) and see how it comes up. Check the References section for that, too. If there's nothing in Wikipedia, try it again in www.google.com and take a look at different websites.
Another teacher here may have a more definitive answer for you, but this is how I would handle it.
Thank you for using the Jiska Homework Help Forum. How interesting that I never even saw this posting! There are so few foreign language questions that I hate to miss ANY! If you mean "d'" then the last name must begin with a vowel (A, E, I, O, U, Y, etc.) There are many with "de," for example Guy de Maupassant.
At the moment, I'm stypmied and can only think of:
Charles d'Orléans, (1394-1465)
Agrippa d'Aubigné (1552-1630)