It's certainly complicated. I've seen naming like this in my own research and it's pretty much mothers maiden name.
But as you are certain her maiden name wasn't Tyrell, it's much harder to work back from..
There should, as you rightly say, be a relationship, but if there isn't it's even harder.
Tyrell is an easy enough name to find, I briefly found them in Maids Moreton, Hardmead, North Crawley in several families, although not Castlethorpe. Yet.
Mike