The Black family tree (image that's widely circulated and has been composed on the computer, not the original hand drawn one--I can't find a copy of that at the moment) lists Melania's surname as "McMillan". Is it known whether this was written incorrectly or whether it's correct and Melania's surname is, in fact, McMillan instead of MacMillan?

ETA: 1. it was me earlier and 2. the lexicon has her surname listed as 'Mcmillan'. LemonFairy 07:53, October 10, 2010 (UTC)

It could just be a spelling error like Phineas/Phineus Black.