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At one point, Dagbert describes his curse by saying that in his thirteenth year, the firstborn son of “the Lord Grimwald” must kill or be killed by his father, which suggests that, if the character referred to as Lord Grimwald has multiple names, the title Lord Grimwald is the most official, the one he most favors, or the one which is most closely linked to his identity. Regardless, it’s a hereditary title, which means that, by the end, Dagbert is the Lord Grimwald and has his own castle. (This is never additionally ).
From the way Dagbert and Lord Grimwald describe it, it sounds like they started calling Dagbert “Dagbert Endless” for the heck of it. It would be very cool if his many names came from his mother—there is so much untapped potential that comes with the half-mermaid thing—and it would also make sense if Dagbert’s many names were a necessity. If he keeps committing murder/magical manslaughter (depending on how much control he’s in), he might be a wanted criminal under some name(s) and need aliases.
Dagbert having endless surnames but Lord Grimwald only having "Grimwald" implies Dagbert either inherited his many surnames from his mother, or Lord Grimwald also has many surnames but managed to pick one. If they're from his mother, it implies that mermaids all have long names. If they're from his father, then I think it's safe to say that a man who chose the name "Grimwald" is likely to be the idiot who decided to name a baby "Dagbert". In this essay I will