The database I cited requires exact use of Polish diacritical marks. If you can't enter those, you can use ? for a single letter and * for multiple letters.
The Koliński surname (note the accent over the n) gets 2685 hits, with the most near Warsaw, Bydgoszcz, and Gdańsk:
Wa:310, BP:7, BB:10, By:254, Ci:21, Cz:14, El:43, Gd:196, Go:46, JG:38, Kl:117, Ka:98, Ki:29, Kn:147, Ko:5, Kr:37, Ks:2, Lg:60, Lu:17, Ło:81, Łd:149, NS:4, Ol:25, Op:28, Os:2, Pl:82, Pt:1, Pł:75, Po:143, Ra:21, Rz:3, Sd:7, Sr:134, Sk:70, Sł:51, Sz:154, Tb:16, Ta:4, To:55, Wb:28, Wł:14, Wr:51, ZG:36