It is fun to name them, especially the medieval ones. It is hard once their numbers start getting a little high.... That is a great idea to store their names in their head.
I stored all their names in the space of their heads, like another collector.
That just triggered a totally random memory.... my brother used to have the indians scalp my little settler clickys by popping their hair off.
Three cheers for the way that Playmobil inspires imaginative play in children (you were children at the time, weren't you!? )