Guys! And what names you rare, that is, they occur in a single form, that is just one name and no more of this. Conduct an experiment, count all the names of boys and girls in the classroom, at school, in the village, if you live. Look what names are frequent, that is, they occur in different classes. For example: Sasha, Katya, Olga, Sergei has to 5,7,8,9, 11 classes. How much of their total number. Total 19 names and imyanositeley 379. Among them are many human Sasha, Katya much etc. We have, for example, rare names are Makar, Barbara, Arseny, Bogdan.