Is the 1851 George Allberry in Cheltenham age 51?
If so, the birthplace appears to be Sevenoaks (7 Oaks), Kent.
The name is not Manx and I saw no Albrays, De Albrey or De Albrays in Brian Lawson's exhaustive IOM burial index.
The name(s) seems to be most common in the South of England.