Gallia (country) = '(La) Gaule' / '(Les) Gaules' plural form is somehow obsolete.
Kingdom of Gallia = '(Le) Royaume Gaulois' / '(Le) Royaume des Gaules' can be both used.
House of Gallia = '(La) Maison Gauloise'
Gallics (people of Gallia) = '(Les) Gaulois'
Anyway, you did a nice job Enoch.
Edit :
Ah... Noble titles
Marquis / marchioness = (Le) marquis / (La) marquise / (Le) comte de la marche / (La) comtesse de la marche
Baron / Baroness = (Le) baron / (La) baronne
Count | Earl / Countess = (Le) comte / (La) comtesse
Duke / Duchess = (Le) duc / (La) duchesse
Prince / Princess = (Le) prince / (La) princesse