Several fictional characters are supposedly related to people from the real world. In Toobworld, examples include Vera from 'Alice' & Art Carney and Megan Russert ('Homicide: Life On The Street') & Tim Russert (NBC News).
And there are those who are related to real historical figures. Although it was mentioned in BookWorld, Sherlock Holmes claimed to be related to the painter Vernet. So the same should apply to his televersion. (Portrayed by Jeremy Brett, NOT Cumberbatch or Miller!)
Toobworld Central has another one to add:
Ensign Tess Allenby of the starship Enterprise.
In the main Toobworld, Allenby was seen in the "Daredevils Of The Desert" episode of 'The Young Indiana Jones Chronicles'.