I like
Irene too, and I wish it felt more natural to me to pronounce it eye-REE-nee because I think that's even prettier. I wouldn't have trouble adjusting to pronouncing it that way, though, if I met someone who did.
Sunday doesn't seem like a very masculine name to me. I don't think I'd like it on a boy, even as a middle name. But it sounds bright and fanciful, like it means something to somebody if it's used as a name. I don't really have any strong sense of disapproval about a man with the middle name
Sunday, since middle names are generally kept pretty secret anyway.
- chazda