Named in memory of Jan Fri? (1863–1897) and Josef Fri? (1861–1945), the two brothers who founded the Ond?ejov Observatory. On 1898 Jan. 21, one year after Jan's sudden death, Josef started to bring to fruition their shared idea of establishing an astronomical institution. He purchased the land, and he adopted Jan's name as his own second name. The observatory grew extensively during the twentieth century and became internationally renowned. It was at Ond?ejov that Josef Jan Fri?, together with František Nušl, discovered an anomalous refraction effect and developed astrogeodetic instruments, such as the well-known Nušl-Fri? circumzenithal, for the determination of geographical coordinates. Name proposed by M. Kopecký, astronomer and archivist of the Ond?ejov Observatory.