This is all the same person, the ex-wife of Michael Gira of Swans, Siobhan Duffy (and Siobhan Duffy Gira when married):
One can’t merge them manually without losing info because one of the copies identifies her as “Relative of Michael Gira” (true):
and another as “Member of The Gunga Din” (also true):
While another has no additional info:
Note how different copies are all credited on some, but not all, of the same albums.
The Discogs entry:
https://www.discogs.com/artist/358331-Siobhan-Duffy
(note that Discogs also has https://www.discogs.com/artist/7705194-Siobhan-Duffy-2 which as far as I can tell is probably really a different one)