Where does “Celchyth” come from?

Celchyth (Old English) comes from Old English cealc, from Proto-Germanic *kalk, from Latin calx, from Ancient Greek χάλιξ — small stone, pebble; gravel, rubble.

Ancestry of “Celchyth”, step by step

Celchyth traces back through two separate lines of ancestry.

via Old English cealc

Step	Language	Word	Meaning
1	Old English	cealc	plaster, mortar; chalk
2	Proto-Germanic	*kalk	—
3	Latin	calx	limestone; chalk; the finish line
4	Ancient Greek	χάλιξ	small stone, pebble; gravel, rubble

via Old English hȳþ

Step	Language	Word	Meaning
1	Old English	hȳþ	landing place; harbor, landing-place

Every word from Ancient Greek χάλιξ →Every word from Latin calx →Every word from Proto-Germanic *kalk →