The word seems to have an equivalent in Irish bablóir. See eDIL: Electronic Dictionary of the Irish Languagebablóir, although that entry does not include any attestations with the sense of 'minstrel'.
s.
1occupationbabbler, Irish minstrel who performs by talking (foolishly):
(
1366; MS: 1570-1610
)
est [...] defendé que nulles minstrels irroies, c’est asçavoir tympanours, ferdanes, skelaghes, bablers, rymours, clersaghours, ne nullez autres minstrells irroies veignent entre les Engleis
52.XV.5
babler (1366)