[ba:d] is "bard"; Shakespeare is sometimes called the Bard of Avon (the place where he was born).
As Anglika says, this may be a regionalism. But in my experience of many Northern accents, the RP /æ/ is often replaced a different vowel, but not a long one.
A Northerner imitating my (London - but on the RP side, rather than the Cockney

) accent used to replace the RP /ʌ/ (of "buck", "duck" ... etc

) with [a:].
b