to follow up on the possible norris connection ( a name strongly linked with Castletown + many senior posts in 17thC - see manxnotebook)
Isable Norris was I think d/o Wm Norris + Elizth cain - Wm was I think son of John Norris + Alice Bridson (there was another son Thomas) - wills for most of these are on manxnotebook (or www.lawsons.ca) - you should be able to push this line back to early 16th C