The book introduces the reader to the world of words that are surnames, names, pseudonyms of people, names of geographical objects - mountains, rivers, seas, cities, villages, streets, names of stars and planets, names of characters of Russian and Soviet literature, folklore. In addition to their important social function, these words are often the most interesting monuments of history, culture, language of the peoples of our country and the world. What ways do scientists go, trying to reveal the secret of the origin and meaning of the name "Moscow"? How to choose a name for a newborn? How old is Santa Claus and his name?