Enumerating "islands"

[emyoulation]

The quickest way is something @GeorgeWilmes recommended about 5 years ago. You can visualize the scope and size of your ‘islands’ by importing a GEDCOM export into yEd. (I prefer to think of them as windfall or downed branches.) Rolling over nodes will pop-up an identifier.

Finding orphaned people in Gramps

A nice tool for identifying fragment is yEd diagramming a GEDCOM exported from Gramps. See a sample digram of a complex network in another thread. [Gramps "example" data in yEd]