Man, some people just read what they want to read, and not what is actually written... 
I said, many people will inevitably think of OM when they hear the name. Not all people, but many people. And this very thread proves it - lots of people have come on to say they would think of him.
Doesn't mean it's a problem though, or that they will always and only think of him.
As for the name Madeleine, again, it's only a fleeting thought. If you can hear a name and not have it conjure up any past associations (someone nice you worked with who made you like a name, a person you disliked who put you off a name, etc, etc) then good for you.
The person posting that thread was asking for honest opinions: did people think of MM when they heard the name - as when she'd mentioned it to people in real life, they'd been a bit shocked that she was considering it. Now I think that is ridiculous - to not choose the name for reasons of the MM association is bonkers, but likewise, I admit I would think of MM but that would be it, and the new 'owner' of the name would quickly make it their own.
As with baby Oswold/Oswald.