The name 'Radomysl' has ancient Slavic origins and is based on the toponym 'Radomyshl', which is still used in the Volyn and Zhytomyr regions. This name consists of the adjective root 'rad-', meaning 'joy', and the noun root '-mysl', meaning 'thought'. Therefore, 'Radomysl' can be interpreted as 'one who has joyful thoughts' or 'one who thinks joyfully'.