Everyone in my family knows two people with the same first name / last name combinations: my father and me.

Two of the people I regularly work with share the same name.

If I'd use an N900 not as a private, but as a professional phone, I'd have even more name conflicts because they are quite common in our company and we have a lot of mail addresses like firstname3.lastname@company.at (in case there's three people with the same name).