Re: Research on the name Island or Illand
The French Island or Illand were located in the North West of France and migrations to Ireland are unlikeable. On the contrary legends say that these Illand came from England or more probably Ireland. Anyway the name has certainly celtic origin (France, England or Ireland) We have in France the villages of "Island" and "St Ilan", and in Wales (England) the village of "Illand". In some irish legends like "the annals of Tigernach" we often find the name or first name "Illand" (see celtic sites on the web or research on the word "illand") I have my proper site on the french Illand (http://j.illand.free.fr/) but it's in french.
You can also have a look at this irish site (about an Hyland family, but I'not sure Hyland and Illand have the same origin)
Pleased to exchange more information about that name