fréa literally means 'lord' or 'king', but the reference in Fréawine's name is more likely to his father, whose name happened to be 'Fréa'. The notion of Fréawine being his father's 'friend' or 'companion' may not be accidental - Fréa's father Aldor enjoyed an incredibly long reign. This meant that, for the period between Fréawine's birth in III 2594 and Aldor's death in III 2645, Fréa and Fréawine were heirs-in-waiting together for a total of fifty-one years.
Even more remarkably, Fréawine's own son Goldwine, and Goldwine's son Déor, were all born within Aldor's reign. At one point, between III 2644 and III 2645, five generations of the royal house of Rohan were extant at the same time. When old Aldor died, his young great-great-grandson Déor was about one year old.