Same name and same date of birth (including year)

There isn't enough information to answer this question. It depends on the distribution of names in said given population-- each given population would have different distribution.

Like in South Korea, the last name Lee applies to one third of the population... and the most common last name in Italy, Rossi, applies to less than 1 per cent.

in the 50 year range only one day is the same date of birth

i'm so hoping this helps

Has anyone ever answered this? I have met a girl who has the same exact name (first + Middle + surname) and she was born less than 24 hours after me, as a matter of fact, if she'd been born an hour earlier, we would have the same name and DOB.