Aldenberg is a Dutch surname, primarily found in the Netherlands. It is a variant of Aaldenberg, which originally denoted a person who came from a place called Aaldenberg, meaning "old mountain." The etymology combines aald (an older form of oud, "old") and berg ("mountain, hill"), typical of Dutch toponymic surnames that describe a hilly feature or a settlement on higher ground. The name likely arose in the eastern or southern parts of the Netherlands, where such geographic surnames are more common. Surnames like Aldenberg and Aaldenberg would have been borne by families who lived near or owned properties named after the "old hill"; as populations grew, the name became hereditary. According to public distribution data, Aldenberg is a relatively rare surname today, concentrated mainly in the Netherlands. Variants may also appear as Van Aldenberg or Van Aaldenberg, preserving an outdated inflection meaning "from the old mountain." This surname follows a common Dutch pattern of formation with berg, comparable to others like van den Berg or van Soestbergen.