How sorting work on adress book

Good day,

I am a client user of Lotus note 8.0.1 and in my address book (data base, not personal address book), when I sort by company, the Name field is not sorted alphabetically.

For exemple:

Company Name

Toto Samuel

Toto Julie

Toto Andre

Toto Felix

Could Someone explain to me how the sorting works on the address book?

Your input would be appreciated