There is a thread pinned somewhere that covers that.
The officially sanctioned pronunciation is "Eck ee", Like Heck followed by a long E.
And sometimes people forget that it stands for "Escort Client Community Information Exchange".
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Found it:
ECCIE Mission Statement
Welcome to ECCIE.
We're glad you found us. Yes, another alternative here and we truly hope our idea catches on. This is a public board, and for the time being, completely free to join.
ECCIE, pronounced 'ECK-ee', wishes to give you, the hobbyist and provider community, a freely accessible, easy-to-use platform to exchange information and share your thoughts and ideas.
http://www.eccie.net/announcement.php?f=5