A Facebook friend from high school actually e-mailed me a few months before her daughter was born and asked how I liked my name. She mostly wanted my thoughts on weird nicknames or things that might have come up. I told her I loved it and she ended up naming her daughter the same name. I never thought she was naming the child after me in any way shape or form and I was glad I could help her think through the naming process with 33 years of personal experience. If you still feel weird about it, I think that approach -- messaging and asking him how he liked being an "Ira" -- might be the ideal solution. It makes it clear that you're not naming the kid after him but also sort of clears the air.
Beautiful baby girl born 8/13/2012. Little star baby lost at 10 weeks pregnant, 12/18/2013. Rainbow baby girl born 12/22/2014.