Yes, lets all guess which of the 50 has a birthday during the year.
Goodness, for the 28th time in a row, everyone on the list has a birthday. Full marks.
What if someone was born on the 29th of February? They may not have a real birthday this year. (Of course, for legal purposes, their birthday would be considered to be 1 March or 28 February, depending on the country they live in, and they could still celebrate their birthdays on either, but it's not the same as a real bd.)
Granted, the likelihood of this is quite tiny. We only have 1 such day in every four days (except some "double zero" years), so approximately 1 out of 1461 (365*3 + 366) candidates should be a leapling. The probability of a random list of 50 names containing a leap year baby should be around 1-(1460/1461)^50 or 3.37 per cent, but yeah, most of the time all of them should have a birthday.