"Utter marl!", he retorted.
David Barnett - Venice, Florida
>"Marling" is gerundial of "marl", the Germanic verb which means "to tie" or "to hitch" and clearly precedes Old English, our Germanic dialect, as it also branches into Breton and Norman, with Medieval Latin precedents, although these are up for grabs among some scholars, as are questions about Celtic acquisition.
I don't know where you came across your etymology, but I can assure you there is no support for it in the O.E.D., nor in "Old English and Its Closest Relatives: A Survey of the Earliest Germanic Languages" by Orrin W. Robinson, nor in Pollington, nor Clark Hall, et al. In fact, "marling" in English means (and has meant) primarily to "manure with marl", as in "marlite", "marlborough", and so on. Dickens likely chose Jacob Marley's surname name as it hearkens to flavors of things peaty, musty, calcified, as in the adjective "marly", which means what one would suppose. "Marl" can also be dug from a "marlpit", rather than directly issue from a beast: "my shepe to dongue or marle his land.", or "yf God beginne to mucke and marle you." Marl became the common term for a peaty, chalky, clay-like lime-bearing soil that had widespread use as a fertilizer in the Brit. Isles, whether mixed with animal wastes or applied neat.
"Marling" (also "marlyng" and "marlyn") is also a type of twisted line or cord. The earliest attribution of "marlin-spike", "marline-spike", "marling-speek", is 1626.
Ain't words fun? Although I'm thoroughly dubious of your version (although it could turn out to be entirely true), it certainly made for entertaining latenight marlaceous* reading.
*Yes, it's actually a word.