I do not know how the name was pronounced in England, but in the USA I don't think the two syllable pronunciation was just invented by the company. There is a long tradition in English among people with higher education of pronouncing names which come from Greek and which end in "e" with the "ee" sound at the end. Zoe
, Merope, Aphrodite
, Niobe, Penelope
, and Persephone
are all normally pronounced with the -ee sound at the end. Irene
is the only major exception I can think of; somehow the two syllable "eye-REEN" pronunciation developed for that name in the USA and was later also adopted in England. But I have never heard Nike
said in one syllable in the USA.