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A lot of sites on the Internet say that the saint's name, as Endellion, comes from an older Welsh name - either Cynheiddon or Cenheidlon, found in Welsh records.

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Endellion has also been discussed on this message board four years (and a day!) ago (https://www.behindthename.com/bb/fact/5237082).

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Following the pattern of her old names, I came across the Welsh word "cynaidd", meaning "dog-like, canine" (https://en.m.wiktionary.org/wiki/cynaidd), which looks oddly similar to Cynheiddon. Unfortunately, this doesn't seem plausible since during the saint's era Celtic and Welsh names followed a dithematic pattern (as explained in the previous post).

this is guess work, but she is sometimes called Edellienta - maybe a relation to the Germanic element adal (noble)? See Edelgard.