As in frequent!
I know someone who named her daughter Ava and then changed it when there were 4 in her nursery. Changed it to Ada which is much nicer anyway imho! I can understand that as there are a couple thousand Avas every year. But I also know two little Elodies and two baby Marnies - only a couple hundred of them each year.
So how many babies do there have to be with a certain name for it to become common enough that you'd have others in your class? What names do you hear all the time at the moment? Are there any names that you've heard given to several babies within a couple years? The most recent baby of my acquaintance is a Cicely - no others so far!