<baya> ‘bay’ + <an> ‘the’ + <Baskes> Basque people
Historic forms:
Bay of Biscay 1841 Weatherhill
Bay of Biscay 1843 (TA 1843) (Bond, 2009)
Bay of Biscay 1908 (OS, 6”, 1908) (Bond, 2009)
Bay of Biscay 1974 (OS 1974)
Bay of Biscay 1985 (Bond, 2009)
Bay of Biscay 1995 (OS 1995)