There have been rule changes.
For the UK 1841-1901 the enumeration was for person who slept at the address on census night.
This is one reason you will find unnamed persons in the census, .e.g. a homeowner may have known that vagrants, travellers, etc. were sleeping in an out building but may not have known their names.
Manx Genealogy Archive 1 is maintained by isleofman.com
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