marvel cinematic universe - Which Celestial's head is "Knowhere"?

It was mentioned in the movie Guardians of the Galaxy: Vol. 1 as well as in this article and confirmed here, that:

Knowhere — the mining colony located on the edge of the universe in the decapitated head of a long-dead Celestial being
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Which Celestial Being did the head belong to? (if known).

I have also checked the Wikipedia page for Knowhere, but the closest thing to its origins was this line from the creators (Dan Abbnett and Andy Lanning):

Honestly, they just came to us. The severed Celestial head was, I think, something that popped out of Andy's mind one day. Similarly, one morning, I said "what about a talking Russian dog?" We run with these things and develop them together. It's hard to pin down where exactly they originate.

Answer

The pedigree of the Celestials overall is very rare. Few have been named and even fewer have been named and killed in the Marvel Universe. No known Celestial has been identified as the head used in Knowhere.

However, there were once billions of Celestials in the universe and due to a conflict with another early developing race called the Aspirants and the release of a super-weapon called the Godkiller, millions of Celestials were destroyed. It is likely the origin of Knowhere is a remnant from that first conflict billions of years ago. The Godkiller was revealed in Iron Man #13.

The largest collection of named Celestials appeared in Thor #300. Almost nothing is known about them other than their names and some of their designations which were revealed in the Marvel Handbook.

The Celestial Fourth Host: Hargen, Tefral, Nezzar, Gammenon, Arishem, Jemiah, Eson, Oneg, and Ziran. Also included in the image is Thor and the Eternals in their Unimind form. A fan depiction of a scene in Thor #300 (October 1980).

These are Celestials from a parallel universe, who seem to have the same appearance as some of the known Celestials from our universe. Their origin may or may not be the same as our Celestials.

From what we know of the Celestials in our Universe, (in the famed Thor 300) when confronted by the power of Odin, inhabiting the Destroyer (which was imbued with the power of all of Earth's Skyfather deities) and using the fire giant's Surtur's magical sword, Twilight, Odin was unable to harm even one Celestial for more than a moment. The indestructible Destroyer and Surtur's sword were destroyed seconds later. The power to sunder the head from a Celestial (and make it stick) must be incalculable.