I don't mean to be a pain... but:
I have a John Tickner, christned July 1826, Shere, Surrey. He was son of Charles Harris and Amelia Tickner.
Charles Harris was born 1782 in Cranleigh, Surrey and died 1843. He married Mary Tickner in 1802 in Shere. Mary was buried in 1812, Shere. This couple had four children, all surnamed Harris.
Now Charles Harris and Amelia Tickner were not married. They had four children:
1. Henry Tickner alias Harris, chr. Aug. 1816, Shere
2. Jane Tickner alias Harris, chr. Jan. 1819, Shere
3. John Tickner, chr. Jul. 1826, Shere
4. Emma Tickner, chr. Jun 1831, Shere
The parents of Charles Harris were David Harris (chr. 1 January 1752) and Ann Cumber.
Coincidence?