how do I index people with same last name and bunch of them with same first name only.

Rosa VinetaLefau Mata'u

how do I index people with same last name and bunch of them with same first name only.

Julia Szent-Györgyi

Depends on the project.

If it's a city directory, and all of the indexed fields would be the same for two entries, you only index one of them.

For example, if the directory says:

Abbott, James M. 123 Main St
" James M., Sr., 456 Maple Ave

then you'll only index one entry with surname = Abbott, given names = James M, since neither the suffix nor the address are indexed.