@BillRM,
I was born/bred & have always lived 'in & nearwith' Swansea - There are No Swans hereat, except a few in park-ponds and Trust-sites - Apparently derived from 'Sweyn/Sven/Swyen' Some Norse/vikingy fellas' from longeth agoeth.
poem (Ad-lib, by me)
If I awaken 'pon the morrow
And my known hometown no longeth doth entitle unto Sweyn
I will stilleth clean my teeth
Wash my face
and bare my stain
Unless my new hometowneth
Doth thus calleth its new name
Hill'ry of de clint'neth
I will care not
Its Reclaim.
Have a Lovely day