There is a William McKernan in the 1851 census of the townland of AGHADAVY , which is very close to TULLYBALLYDONNELL. He is listed as a servany in the following household.
Z3 AGHADAVY TOWNLAND
GEORGE MCKINSTRY /HEAD/M/63//FARMER/ANT/
MARGARET MCKINSTRY /WIFE/M//51/NONE/ANT/
MARY MCKINSTRY /DAUGHTER/U//22/NONE/ANT/
JAMES MCKINSTRY /SON/U/20//FARMER/ANT/
HANAH MCKINSTRY /DAUGHTER/U//17/NONE/ANT/
REBECCA MCKINSTRY /DAUGHTER/U//15/NONE/ANT/
GEORGE MCKINSTRY /SON/U/13//NONE/ANT/
HENRY MCKINSTRY /SON/U/10//AT SCHOOL/ANT/
THOMAS MCKINSTRY /SON/U/5//NONE/ANT/
WILLIAM MCKERNAN /SERVANT/U/25//PLOUGHMAN/ANT/
ROBERT MAGILL /SERVANT/U/16//LABOURER/ANT/
Also the following families:
Z9 AGHADAVY TOWNLAND
ROSEY MCKERNAN /HEAD/W//60/NONE/ANT/
MARGARET MCKERNAN /DAUGHTER/U//23/LINEN WEAVER/ANT/
MATTHEW MCKERNAN /SON/U/14//CAMBRIC WEAVER/ANT/
JAMES WALKINGTON /GRANDSON/U/3//NONE/ANT/
Z30 BALLYKELLY TOWNLAND
JAMES MCKERNAN /HEAD/M/25//LABOURER/ANT/
ROSE MCKERNAN /WIFE/M//27/WINDER/ANT/
MARY MCKERNAN /DAUGHTER/U//2/NONE/ANT/
BALLYKELLY townland is beside TULLYBALLYDONNELL, and AGHADAVY townland has the townland of MOYGARIFF between it and TULLYBALLYDONNELL.
These details were extracted from:
http://homepage.ntlworld.com/derek.hawthorne/Antrim5111.htmlHope this helps
OTTO