Henderson name seems to be associated with Ramsey (eg the Henderson ran the Saddle Inn for many years, also Hendersons were smiths & coach proprietors) - name doesnt seem to crop up elsewhere in my victorian directories. From an article by Rex Kissack looking at family names in Lezayre the Hendersons would appear to be there by 1760 (almost certainly Scots comeovers); the connection with Clark and Canada also indicate a Scots rather than a manx family
The name Banks is often associated with Onchan but is reasonably common