"Earldom" refers to a specific area or territory that is governed by an earl, who is a noble rank in some countries. It can also represent the title held by the earl. Full definition
This same scheme of associating their scents with nobility and royalty carries over into the Arlington (a famous earldom), Windsor (as in Windsor Castle) names as well, each of them old school scents, and the soaps can be matched up to the colognes of the same name. (primandprep.com)
We weren't trying to imitate the Royal Family, and we're not long - lost heirs to some sunny earldom. (romper.com)