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You can totally use Cole and Adrian. Aven and Adrian aren't that similar at all, just that they have an A and an ending 'n' sound. As for Cole, it's his middle name (which usually are used very rarely in reality unless they're going by their middle name). Plus, it's your cousin. It's not like your sibling named her/his kid Cole fn which would be pretty off-limits then. Also, since you're not even having a child at the moment, by the time you do, his middle name won't be of much consequence. :)