Demophilus.
De Morgan.
Demosthenes.
Other such names are Ap Thomas, Des Barres, Du Chaillu, Fitz Allen, La Motte Fouqué, Le Sage, Mac Fingal, O’Neal, Saint-Réal, Sainte-Beuve, Van Buren.
This is the universal custom, founded on the fact that the prefixes are often not separated in printing from the following part of the name. It would, of course, be wrong to have Demorgan in one place and De Morgan in another. {86}
228. Arrange personal names compounded of two names with or without a hyphen after the first name but before the next longer word.
Ex.
Fonte, Bart. de.
Fonte Resbecq, Auguste.
Fontenay, Louis.