A fun take on a word "identity". It also is a great mash between "identity" and "idea".
Idendify has eight characters and four syllables. Established brands using four syllable names include StumbleUpon, Coca-Cola and Panasonic.
Idendify.com is a dot com domain. Dot com domains are the most sought after top-level-domain in the world, famously used by websites like twitter.com. Owning a dot com says that you own the word "idendify" online.