The Dictionary of Polish Place Names (Nazwy Miejscowe Polski) explains the origin of place names in Poland and details how the place name changed over time.
Volume X of Nazwy Miejscowe Polski lists several place called Sielc. The third entry is for a village currently in the Masovian Voivodeship and which belongs to the Szelków parish.
Nazwy Miejscowe Polski indicates that Sielc is now two villages, Nowy Sielc and Stary Sielc, was in the Rzewnie Gmina, Ostrołęka Voivodeship in the years 1975-1998, and is 12.5 kilometers southeast of Różan. Mentions of the village include Syedlecz, Sedlecz in (1421) 1456, Szedlecz in 1428, Syedlecz, Sedlecz in 1431, Syedlecz in 1480, Zedlecz in (1502) 1517, Sielcz in 1582, Sielce in 1783, Sielc in 1827, Sielc in 1839, Sielc Nowy, Sielc Stary in 1889, and Nowy Sielc, -wego -ca, nowosielecki, Stary Sielc, -rego -ca, starosielecki in 1971.
Currently, Sielc consists of two villages with names containing differentiating elements derived from the adjectives nowy [new] and stary [old].
Source: Rymut, Kazimierz, Barbara Czopek-Kopciuch, and Urszula Bijak, eds., Nazwy Miejscowe Polski (Place Names of Poland) – Krakow 2016, Volume XIII, page 150.
Click the link for a PDF copy of the Nazwy Miejscowe Polski entry for Sielc. Translated from the Polish, the entry reads:
Sielc (3), today Nowy Sielc and Stary Sielc, two villages, Ostrołęka voivodeship, Rzewnie gmina, 12.5 kilometers southwest of Różan: Syedlecz, Sedlecz (1421) 1456 SHGMz (MK 3, 77); Szedlecz 1428 MkM I no. 756; Syedlecz, Sedlecz 1431 MkM II no. 525; Syedlecz 1480 SHGMz (Ep. 13, 276v); Zedlecz (1502) 1517 SHGMz (Z 20, 471–472); Sielcz 1582 ŹDz XVI 392; Sielce 1783 MpPerMz; Sielc 1827 Tabella II 167; Sielc 1839 MpKwat IV 2; Sielc Nowy, Sielc Stary 1889 SG X 524; Nowy Sielc, -wego -ca, nowosielecki, Stary Sielc, -rego -ca, starosielecki 1971 UN 129, 39, 40. — Currently two villages with names containing differentiating elements derived from the adjectives nowy [new] and stary [old]. Lithuanian: ZMaz 330. Urszula Bijak
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