Soběslav is a masculine given name documented in Czech and Old Czech. English Wiktionary traces it to Proto-Slavic *Sobęslavь. English Wikipedia gives the meaning “having own glory”.
2 source accounts
Proto-Slavic origin
Source-reported
Meaning: “having own glory”
Derived from Proto-Slavic *Sobęslavь (“wise + glory”), first attested in the 12th century. Possibly cognate with Ancient Greek Σοφοκλῆς (Sophoklês).
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