Derby, Edward, 14th Earl of.
Derby, Edward, 15th Earl of.
and parents and children with similar names are arranged according to seniority, like
Dumas, Alexandre.
Dumas, Alexandre, fils.
It is sometimes recommended to place distinctions of this nature with the surname, as
Johnson senior, Thomas.
Johnson junior, Thomas.
but this is not a very happy form.
Names of a person in different forms must not be alphabetised under those forms, but one selected and all concentrated under it, as it would be foolish to have separate entries under say Shakspere, Shakespeare, Shakspear, Shakspeare, though the variety in the name can be shown in the different entries under the form adopted.