Mazowieccy
Mazowieccy is a Polish term with two principal uses. As a demonym, Mazowieccy denotes inhabitants of Mazovia (Mazowsze), a historical and administrative region in east-central Poland. People identified as Mazowieccy live in the region’s towns and countryside, share cultural traditions, and generally speak Polish. The region’s most prominent city is Warsaw, but Mazovia encompasses a broader area with a long history central to the Polish state.
As a surname form, Mazowiecki is a Polish surname derived from Mazovia; Mazowieccy is the masculine plural