Thanks Sue, one mystery solved

I was wondering ... if William died whilst living with Rosina, who couldn't spell her own surname juddging by the Censuses records, could his name have been misspelled?
He had a half-brother from his father's second marriage (m. Jane Lumley in 1871), Leonard I'Anson (same name as his father), who died in 1938 in Durham, but I suppose they were not acquainted?
Apart from him, William had no next of kin and being retired for so long, what would have been the source of his name for the purpose of registering his death?
An example of this:
Name: Age at Death (in years):
AMSON, WILLIAM 58
GRO Reference: 1921 S Quarter in STONE Volume 06B Page 28