I far prefer
Everett, which has the same feel. I just can't imagine a (comparatively small) human called Everest. And imagine if he were short ... He'd never live it down.
Of your combos, I'd choose Everest
George. I really dislike
William, and it seems to be soaring. (As if it wasn't overused enough to start with!)
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♥
Elinor♥