None that I see, not in the linked sources on Christopher's profile. Wiltshire likely comes from the "Essex Antiquarian" article on Mary's profile that says it was "perhaps" the origin of Richard Bartlett, father of Christopher. The profile was originally a gedcom import from somebody who is no longer the PM so...I agree with you, Unknown and unknown but probably England should be used.
And spoiler alert her hubby Christopher Bartlett, son of Richard also had a problematic mother "Joan" Unknown who really seems to be Unknown Unknown of Unknownsville so I spruced her up a bit too.
