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Like another american surname BO, BOA could come from different european immigration in America.
-A british immigration (English and Irish)
- An Italian immigration
- A Spanish and South American immigration
- A hungarian immigration.

BOA is still an italian surname of the region of VENICE,
especially the province of TREVISO.
It could be a feminin form of BO that in local dialect means
OX or OXEN, an animal used for transport.

I ignore the meaning of BOA in the other languages.