It would be useful to know where these Bonnells were born and where they lived as adults. Just a suggestion.
Forgive me if you know all this, but here goes:
For DNA testing, you need Y chromosomes, which are passed down unchanged from father to son to grandson. I.e., you would have to be a direct MALE-LINE descendant -- and a male yourself, of course; females don't have Y chromosomes.
Now, I'm a direct descendant of Loyalist Isaac
Bonnell of
New Jersey and then
Nova Scotia -- but via his granddaughter Maryanne
Sophia Bonnell Wetmore, my great-great grandmother. I'm a direct male-line descendant of her husband Timothy Robert
Wetmore of Gagetown, New
Brunswick. (I'm still searching for Isaac's antecedents -- my primary"brick wall.")
I participated in the
Wetmore DNA project and verified that I am indeed a
Wetmore. I have one marker that's different from those of other participants, but that's a normal mutation.
Best regards,
Warren