AUXILIUM not AUXILUM The last word is ALTO not ALLO
"Auxilium meum ab alto" means "my help from above" in Latin.
According to "Armorial Families" (published in 1884), which I consulted, this was the motto that accompanied the heraldic arms of General Sir William BLAKENEY who was created a peer - Lord Blakeney (not Bleakney, sorry!) - in 1756. He died without issue in 1761 with no children With him the title became EXTINCT.
His younger brother, Robert, inherited the estate (but not the title nor the arms). He had a nephew named John, who came to the American colonies about 1750.
There is no such thing as a "family name" coat of arms; they are granted to an individual and to his male heirs. Anyone who tries to sell you someone else's crest is just trying to rip you off. Sorry!