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Here are some guesses about books I haven’t (recently) read:
Jassy and Juniper in Rose’s Blog in the Casson Family Series share an initial, but their father named them for different things. Their grandmother Eve had a twin sister named Linda.
Massive Numbered Siblings says that in Anime/Pokemon, Brock has twin siblings named Billy and Tilly. (In Japanese, all his siblings have number-based names.)
I haven’t seen Maya And Miguel, but I think the title characters are twins.
Would it count if the twins' names put side-by-side made up the name of another person? Like if their names were Lewis and Carroll?
I think so, but I'm not sure. Tropes Are Flexible, however.
Maybe the Nick and Tesla series is an example of this?
As far as the Kirby/ Fumu & Bun not being related in name, that's not entirely true: it just precedes modern Japanese, and therefore is not a readily-identifiable example. The final N character () is discussed thoroughly in Hadamitzky & Spahn's Kanji & Kana, 3rd Edition, and even [http://en.wikipedia.org/wiki/Gojuuon The Other Wiki] mentions it in their opening paragraph on the preferred method of collating Japanese.
Therefore one (albeit somewhat archaic and dated) rendering of their names would have them looking like 'Fumu' and 'Bumu', a point driven home with the fact that 'Fu' and 'Bu', in kana, are the same character, just with softening marks for the 'Bu'
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How well does it match the trope?