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Semi-related, the Old English word for cemetery was "licburg": corpse-town. The lic- in that is the source of "lich".

By contrast, etymology for "lichen" has nothing to do with corpses, apparently:

Borrowed from Latin līchēn, from Ancient Greek λειχήν (leikhḗn), from λείχω (leíkhō, “to lick”).

Which, I must presume, is derived from the behaviours of animals which eat the stuff, licking it off rocks.

Off topic: it's always been strange to me that "lich" isn't pronounced like "like" like in "lichen". Even after hearing the 'correct' pronunciation plenty of times I still usually hear it 'like' in my head.

first time I read it I mentally pronounced it kinda like loch with an i

Me too, especially today!