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It's kinda getting trendy, but still likable... If you want to prn. you mention, it's prob'ly better w/out the h or people might sometimes say ma-thigh-as) and while both are ok, it's better to go w/ the one that points more strongly to the prn. you're wanting.
I guess they'd be ok as bro.s. I wouldn't use Cecily w/ anything bec. of the meaning.
I suppose you could use Tees as a nn... Not everyone has to have a nn. My parents addressed me by a nn until I was almost 8 and found out my real name, after which I started insisting on that and ONLY that. They never used nns for either of my bro.s.