I was researching the Hutchill name and found it to be suprisingly rare and most of the records are for Drewsteighton, Cheriton Bishop and Hittsleigh, all three places that are only a few miles from each other in Devon.
Futhermore I found various Hutchill born 1793-1810 on FindMyPast and Ancestry with either their baptism record stating they are children of William Hutchill and Jane, or marriage records with William Hutchill as a witness so I believe them to be siblings and William and Jane their parents
Sarah 1793
Richard 1795
Anne 1804
Jane 1808
John 1810
and most interestingly there is a death record for John
Lias Hutchell, 1887, Crediton. Age 80 so my theory is
Lias comes from their mother Jane i.e Jane Lias
I cant find a marriage record for William Hutchill or Jane Lias, so perhaps they did not actually marry hence the liberal use of Lias in their descendents.
BTW I plan to add to wikitree when I have done more research, Anne Hutchill is already added please see
https://www.wikitree.com/index.php?title=Hutchill-1&public=1