I have no other information on the Seavers, Dollards, or Lockes. However, a Seaver reunion was held at Malahide Castle (County Dublin) in July 2002. Have you contacted the Skerries Historical Society? Their e-mail address is on their website. Another good source is the Fingals Heritage Group.
My interest in Skerries concerns the Halpin, Farrell, and Magee lines.