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 IX of Nazwy Miejscowe Polski lists one place called Pomaski-Kownaty. This entry is for a hamlet, formerly a village, which belonged to the Szwelice parish. Listings for Pomaski-Kownaty were found until 1967.
Nazwy Miejscowe Polski indicates that Pomaski-Kownaty was in the Szelków Gmina, Ostrołęka Voivodeship in the years 1975-1998 and was located 6 kilometers southwest of Maków Mazowiecki. Mentions of the village include Cownaczsky’s mórg in 1448, Slasske borders, Cownaczske and Swyelyczske in 1467, Kownathy in 1487, Cownathy in 1511, Pomaski Kownathi in 1582, Pomaski in 1783-84, Pomaski Kownaty in 1827, Pomaski Kownaty in 1839, Pomaski Kownaty in 1887, and Pomaski-Kownaty in 1967.
Pomaski-Kownaty was formerly named Kownaty from the name of a settlement called Kownata, in the 1st person plural. From the 16th century, the village was called Pomaski-Kownaty. See Pomaski Wielkie about the first part of the name.
Source: Rymut, Kazimierz and Barbara Czopek-Kopciuch, eds., Nazwy Miejscowe Polski (Place Names of Poland) – Krakow 2013, Volume IX, page 136.
Click the link for a PDF copy of the Nazwy Miejscowe Polski entry for Pomaski-Kownaty. Translated from the Polish, the entry reads:
Pomaski-Kownaty, the hamlet was listed until 1967, formerly a village, Ostrołęka voivodeship, Szwelice gmina [in the years 1975-1998], 6 kilometes southwest of Maków Mazowiecki: Cownaczsky’s mórg [a mórg is an area of land; Gerald Ortell’s book on Polish Parish Records states that in the Russian partition 1 mórg = 1.388 acres] 1448 SHGMz(MK 4, 84); Slasske borders, Cownaczske and Swyelyczske 1467 SHGMz(MK 5, 86); Kownathy 1487 SHGMz(Ep. Il, 274v); Cownathy 1511 SHGMz(Ep. 149, 161v); Pomaski Kownathi 1582 ŹDz XVI 392; Pomaski 1783-84 RejKor 517; Pomaski Kownaty 1827 Tabella II 107; Pomaski Kownaty 1839 MpKwat IV 2; Pomaski Kownaty 1887 SG VIII 737; Pomaski-Kownaty 1967 SM 899. – Formerly named Kownaty, from the name of a settlement Kownata SSNO III 115, in the 1st person plural. From the 16th century, Pomaski-Kownaty; see Pomaski Wielkie about the first part. Lithuanian.: ZMaz 303. Urszula Bijak
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