In French names, "de" means "from". This is fairly frequent, as are beginnings with "d" or "du" for the same reason.
le Pays de Galles is the name for the country 'Wales' in French.
it does not mean anything. If it is a name of French origin, it is possible that it was formed from the suffix "de", plus the name of the place where the person lived, as is common for many French names.
Nom de la guerre - French for Name Of War
It translates from French as 'his name is'
"Ile de Re" in French translates to "Isle of Re" in English. "Ile" means "island" and "Re" is the name of the specific island.
De
in frnch scissors is: ciseaux in french, the sentence (don't exactly know what you mean by this) the name scissors is: les ciseaux de nom
No it is the feminine, slightly mispellede (Caroline is more accurate and French) for the masculine name, Charles. Charles De Gaulle was a French General and surely a martial type... but the name does not mean anything aggressive.
from (followed by a placename) - it could mean that the person in question comes of a noble family.
il est gallois means "he's Welsh" in French. "Le Pays de Galles" is the French name for Wales.
Supposing de Warenne is French in origin, it would mean "from the Warren ( a small enclosed piece of land for breeding small game in France)".
(of) French le cours de français: French class