In the society Kurthan's from, last names are not family names. They're titles that a person chooses to describe their personality, or that someone else chooses for them, after they reach adulthood. "Dayslasher" refers to Kurthan's former profession: he used to be a mercenary. The title-name his wife chose was "Nightsaber," and that's the title-name their daughter uses now, though it's much less accurate to her than it was to her mother (Kurthan's wife was an assassin-for-hire).
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