Interesting reading. Thank you Martin and Guest#.

It would seem then that the term was gradually replaced by Portugal from the C16th onwards, at least in England, and appearing in print only rarely.

Still wondering whether the usage of Portingale (or Poirtingéil/Portyngal) in the songs mentioned appears in any C19th or C20th collected versions of these songs (or indeed in any other songs).

Did it survive for longer perhaps in regional vernacular (other than in Ireland and Cornwall)?

Just curious....