You provided no time frame so it's difficult to tell if you are looking for ancestors in the 1670's or 1980's!
Here is a Killian Cosper Schill - Draft Registration found on familysearch.org with a birth of :11 Aug 1888 Ironaton, AL. If this appears to be the correct individual, maybe you will be able to locate an actual birth certificate and find out more. Good Luck.
U S WW1 Draft Registration Cards, 1917-1918
https://familysearch.org/pal:/MM9.1.1/K3PJ-2LT
Kilian Cosper Schill
Residence: R2 Adamsville, AL
Draft Registration June 5, 1917 Jefferson County no 2, AL
Male Birth 11 Aug 1888 Ironaton, AL
NARA Publication Title: WWI Selective Service System Draft Registration Cards
Other results that appear to be the man above:
https://familysearch.org/search/records/index#count=20&query=%2Bgivenname%3Akillian~%20%2Bsurname%3Aschill~%20%2Bbirth_place%3Aal~%20%2Bbirth_year%3A1880-1889~
US Census, 1910, Precinct 45, Jefferson, AL
SELF Killan C Schill M 22y AL
WIFE Fl*Noria Schill F 24y AL
SON Jasper Schill M 6y AL
SON Marlin Schill M y 8m AL
Alabama Deaths
Flenora Taylor Schill
Death 25 Dec 1938 Flat Creek, Walker, AL
Age 52y Est Birth 1886
Spouse's Name K C Schill
Father Oliver Taylor Mother Jane Edson
US Census, 1940 Election Precinct 19, Jefferson, AL
Head Kilian C Schill M 52 AL
Wife Alberta Schill F 46 AL
Dau Gertie Lee Schill F 14 AL
