The S could be SAMWISE, but I can't figure out who the headless 80s singer would be from MWIE. (It's almost 'Bowie', but then there's that spare M).
I'm guessing "Adalgrim's Aunt" is Belladonna Took-Baggins; she's technically his first cousin once removed or something, but that's a closer relationship than between Frodo and "Uncle" Bilbo, so perhaps Hobbits just call anyone one generation above you but within the same extended family Aunt or Uncle.
That N is a puzzler, though, and no mistake.
hS
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