Sromlje was attested in historical sources as Zwaromes in 1268, Swaroͤmel in 1309, and Zwaroml in 1322, among other spellings. The name is derived from the Slavic nickname *Svaromъ via the plural demonym *Svaromľane, therefore originally meaning 'inhabitants of Svaromъ's village', referring to an early resident of the place.[4]
Church
The parish church in the settlement is dedicated to Saint Martin and belongs to the Roman Catholic Diocese of Celje. It is an originally medieval building that was rebuilt in the Baroque style in the second half of the 18th century. Its exterior was extensively altered in the 19th century. A second church in the settlement is dedicated to Saint John of Nepomuk and was built in the 16th century.[5]