I once a class on population genetics in which the instructor commented that the "mitochondrial Eve" idea is kind of over-played. Basically, if you look at any genetic locus, you're going to find some most-recent common ancestor, but that most-recent common ancestor isn't going to be the same for all loci. (So yes, there might be a "mitochrondrial Eve", but there's also a "cytochrome Sam" and they're not necessarily the same person.)
https://en.wikipedia.org/wiki/Coalescent_theory
"""Because of recombination, different gene loci follow different pathways of ancestry, resulting in different gene genealogies. The coalescent is also relevant to phylogenetics, as incomplete lineage sorting between speciation events results in conflict among gene-loci in phylogenetic relationships inferred among species."""
(I'm no expert, but sometimes I think population genetics has one of the most interesting mathematical structures of all the natural processes I know about.)