I like both those names, though to be honest they both look spelled wrong to me. I guess I'm a traditionalist with spelling and would go with Jeremiah or Isiah. When thinking about nicknames I think Jeremiah might get shortened to Jerry, which isn't my favorite. I don't know what you could shorten Isiah to. Of course you could always name him either and nickname him Batman.
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Re: baby names
Of course you could always name him either and nickname him Batman. 
