What does the de in someone's name mean?

The de in french means "from".and in the olden days in Europe people were named either from their paternal family ancestor-(father)... or the town...for example ...Joan of Arc was Jean d'Arc( from the town of Arc)... When the de is separate from the name it connotes nobility. If it is close to the name it is not....for example the previous director of the NY Metropolitan Museum of Art was Philip de Montebello...a nobel family. Presently the de du or d' attached to the name is more common..Deneuve, (as in the actress Catherine Deneuve , the Dupont,(the chemical company founded by a fellow who sold gun powder during the revolution)