Hi Greg,
Keig is tested and is R1a and so there is no connection with Kaighen.
I could not find any traces of living Kegeens or Keigeens. I included Kegg in the list as there might have been one or two still in England but none have presented themselves. So no information on these unfortunately. Generally if I have missed an extant Manx name off the list on the website - someone has contacted me to correct me!!
cheers
John