Here are all the middle names used for [name]Tabitha[/name] found on the 1911 [name]England[/name] and [name]Wales[/name] census and cross-referenced with the CRBI.
[name]Tabitha[/name] [name]Ada[/name] [name]Alice[/name]
[name]Tabitha[/name] [name]Adeline[/name]
[name]Tabitha[/name] [name]Alfreda[/name]
[name]Tabitha[/name] [name]Alice[/name]
[name]Tabitha[/name] [name]Alice[/name] [name]Maud[/name]
[name]Tabitha[/name] [name]Amanda[/name]
[name]Tabitha[/name] [name]Amelia[/name]
[name]Tabitha[/name] [name]Amy[/name]
[name]Tabitha[/name] [name]Ann[/name]
[name]Tabitha[/name] [name]Beatrice[/name]
[name]Tabitha[/name] [name]Bessie[/name]
[name]Tabitha[/name] [name]Blodwen[/name]
[name]Tabitha[/name] [name]Ceridwen[/name]
[name]Tabitha[/name] [name]Charlotte[/name]
[name]Tabitha[/name] [name]Dorcas[/name]
[name]Tabitha[/name] [name]Edith[/name] [name]Mary[/name]
[name]Tabitha[/name] [name]Eleanor[/name]
[name]Tabitha[/name] [name]Eliza[/name]
[name]Tabitha[/name] [name]Elizabeth[/name]
[name]Tabitha[/name] [name]Elizabeth[/name] [name]Mary[/name] [name]Alberta[/name]
[name]Tabitha[/name] [name]Ellen[/name]
[name]Tabitha[/name] [name]Emily[/name]
[name]Tabitha[/name] [name]Eunice[/name]
[name]Tabitha[/name] [name]Evelyn[/name]
[name]Tabitha[/name] [name]Eveleen[/name]
[name]Tabitha[/name] [name]Fanny[/name]
[name]Tabitha[/name] [name]Flora[/name]
[name]Tabitha[/name] [name]Florence[/name]
[name]Tabitha[/name] [name]Georgina[/name]
[name]Tabitha[/name] [name]Gertrude[/name]
[name]Tabitha[/name] [name]Grace[/name]
[name]Tabitha[/name] [name]Hannah[/name]
[name]Tabitha[/name] [name]Harriet[/name]
[name]Tabitha[/name] [name]Helena[/name] [name]Grace[/name]
[name]Tabitha[/name] [name]Hester[/name]
[name]Tabitha[/name] [name]Honora[/name]
[name]Tabitha[/name] [name]Isabel[/name]
[name]Tabitha[/name] [name]Irene[/name]
[name]Tabitha[/name] [name]Jane[/name]
[name]Tabitha[/name] [name]Janetta[/name]
[name]Tabitha[/name] [name]Jessie[/name]
[name]Tabitha[/name] [name]Kate[/name]
[name]Tabitha[/name] [name]Kezia[/name]
[name]Tabitha[/name] [name]Lavinia[/name]
[name]Tabitha[/name] [name]Leah[/name]
[name]Tabitha[/name] [name]Lillian[/name]
[name]Tabitha[/name] [name]Lily[/name]
[name]Tabitha[/name] [name]Lou[/name] [name]Elizabeth[/name]
[name]Tabitha[/name] [name]Louisa[/name]
[name]Tabitha[/name] [name]Lucy[/name]
[name]Tabitha[/name] [name]Lydia[/name]
[name]Tabitha[/name] [name]Mabel[/name]
[name]Tabitha[/name] [name]Mahala[/name]
[name]Tabitha[/name] [name]Margaret[/name] [name]May[/name]
[name]Tabitha[/name] [name]Maria[/name]
[name]Tabitha[/name] [name]Martha[/name]
[name]Tabitha[/name] [name]Mary[/name]
[name]Tabitha[/name] [name]Mary[/name] [name]Grace[/name]
[name]Tabitha[/name] [name]May[/name]
[name]Tabitha[/name] [name]Melda[/name] [name]Sophia[/name]
[name]Tabitha[/name] [name]Melinda[/name]
[name]Tabitha[/name] [name]Minnie[/name]
[name]Tabitha[/name] [name]Miriam[/name]
[name]Tabitha[/name] [name]Muriel[/name]
[name]Tabitha[/name] [name]Nora[/name]
[name]Tabitha[/name] [name]Olive[/name]
[name]Tabitha[/name] [name]Patricia[/name]
[name]Tabitha[/name] [name]Rachel[/name]
[name]Tabitha[/name] [name]Rose[/name]
[name]Tabitha[/name] [name]Rosena[/name]
[name]Tabitha[/name] [name]Ruby[/name]
[name]Tabitha[/name] [name]Ruth[/name]
[name]Tabitha[/name] [name]Sarah[/name]
[name]Tabitha[/name] [name]Selina[/name]
[name]Tabitha[/name] [name]Susan[/name]
[name]Tabitha[/name] [name]Susannah[/name]
[name]Tabitha[/name] [name]Sylvia[/name]
[name]Tabitha[/name] [name]Winifred[/name]
The complete Edwardian name lists can be found here: 1911 Census Name Combos - British Baby Names