[julian_t]

I have several Indian coworkers who have a single name. Our company systems insist on first and last names, so they either end up with '.' as a last name, or the same name twice.

[the_real_cher]

would just make one up at that point.

[aaplok]

This works until someone asks you to produce identity documents matching the computer records.

I've seen people put a single period (".") instead of a last name.