Genealogy / THE MEANING AND RESEARCH OF MY POLISH LAST NAME, SURNAME? [4500]

[Moved from]: Biernacki family in Cieklin - Information needed

Looking for information on Biernacki in Ceiklin, Poland.
John (Jean) Biernacki (1862 - 1949) married to Catherine B. Dedo (Unknown - Unknown)
Children were:
John Biernacki, Jr. (About 1880 - Unknown)
Agata (Agnes) Biernacki (1881 - May 18, 1951)
Francis Biernacki (Before 1889 - Unknown)
Katarzyna Biernacki (Jan 14, 1889 - June 2, 1971)
Victoria Biernacki (About 1890 - June 2, 1970)
Stanley Biernacki (Unknown - Unknown)
Agnes and Katarzyna came to the USA)
I am positive the family lived in Cieklin and attended the big church there.