Just remember one important thing we've overlooked.
The man behind Verichrome at Wratten C.E.K. Mees was Head of Reasearch at Kodak, he would have played a part in naming Kodachrome. The Kodachrome Research team worked directly for Mees who was also a Vice President of Eastman Kodak. (George Eastman had died 3 years before the release of Kodachrome).
Mees went to an English Public school and would have learnt Classics, both Latin & Greek, so the earlier comment about the use of Chrome coming from the Greek word Chroma would be logical to him.