Światosław

Światosław is a Slavic name built from two old pieces. The second, `-sław`, means glory or fame, and it runs through a whole family of Polish names: Bolesław, Mirosław, Stanisław. The first element points two ways. Read as świat, it means world, which gives the Polish sense sławny na świecie, famous across the world. Read closer to święty, it turns toward holy, and that reading is where the English gloss holy glory comes from.

The diminutive is Sławek. It is a plain, everyday form, the one a boy hears on a school register when the full name feels too long for a morning roll call. Sławek belongs to Bolesław and Mirosław too, so it links Światosław to a wider set of bearers without erasing him.

There is a feminine form, Światosława. Both keep the `-sław` ending that ties them to centuries of Slavic naming. The steady part of this name is the glory element. The holy sense was attached later, once the first part was heard as święty rather than świat. What stays fixed is the meaning the Polish keeps: sławny na świecie.