Deep among the roots of Indo-European tongues lies the source of our adverb well, the German wohl, Saxon wel, Gothic waila, an evidently close connection of the Latin verb valeo (to be well); and which the Keltic gwall links again with the Greek καλός (well, or beautiful), related to the Sanscrit kalya (healthy, able, or well).
    Valeo was both to be sound and to be worth, and to the old Roman a sound man was necessarily valiant, worth something in the battle; and valor, which to them and the Italians is still value, is to the chivalrous French and English valour.
    This word of well-being named the old Sabine Valerian gens, one of the most noble and oldest in Rome, who had a little throne to themselves in the Circus, and were allowed to bury their dead within the walls of the city... (History of Christian Names, Yonge, 1884)