..soft like "church"!
But named after an island (ey, eye, eyot, øy, å) belonging to Old King Cole (Ceol), who was - as we all know - a merry old soul ...
... but not, I think, a Greek one (soul or island).
Are there any names, or words, of English origin that have a hard ch? Apart from a few from other languages, pronounced as found on arrival, they do all seem to be from Greek. Even chemistry, which arrived from Arabic, was Greek before it had "al-" agglutinated to it.