It means 'little'.
In Irish: garpháiste beag In Scottish Gaelic: ogha beag
It's a phonetic English spelling of the the Irish Gaelic 'beag' meaning 'little'.
beag
beag
beag
beag
"deartháir beag"
Be aware that 'Gaelic' is actually two separate languages: Scottish Gaelic (called 'Gaelic' in Scotland) and Irish Gaelic (called 'Irish' in Ireland).In Irish: gadhar rua or madra rua (the latter can also mean 'fox')In (Scottish) Gaelic: cu ruadh.
The Scottish Gaelic word for 'little' is beag, pronounced beg.
beag bìodach
Irish: Deartháir beag
do charaid beag (your, singular)