I think it's pretty safe to say that the two terms are unrelated, and that most people on a non-Japanese-speaking community would not make that same connection.
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It's a play for unix filesystem's layout - /sbin
-> kbin. Can't recall the post, but that was answered by Ernest himself.
There is even the folder icon as the logo to make this link clearer.
kbin sounds a lot like karabin, which means rifle in Polish.
Yeah ernest seems to be polish and the polish kbin instance is karab.in. Still it’s kind of a weird name for a link aggregator
Ernest, the kbin developer has addressed this:
https://kbin.social/m/fediverse/t/344/What-is-Kbin-Join-the-Fediverse#entry-comment-969
ケビン is closer, which is just the transliteration of Kevin.