Hi Skoosh,
Hence the reason I mentioned hearing/spelling etc. A way of justifying why the McIlchonnel could very well be MacDonald.
My kin were born and bred on South Uist, Gaelic being their 1st (native) language and pronunciation is somewhat hard for people to get their tongue round at times and then the 5 forebears to establish who you are

I just thought it would be good for other's to read as there are some people who can't understand how their name has evolved into something different from how it started out.
A bit like "chinese whispers"

In this day there is a more thorough regime to eliminate such mistakes but illiteracy in bygone days didn't help matters as they themselves would have been at a great loss as to how their name should be spelled, not forgetting the accent so the transcriber with no Gaelic would have had his work well cut out

To be honest, when I got into genealogy, I was intrigued by finding out those things and it's a great learning curve on the way up the ladder to say the least.
Regards,
Anne Marie.