Sisco:

The Charles Cisco who appears on the 1870 census in Allegheny County, PA, is listed as Charles Sisco in Allegheny County, PA on the 1910 census.

There is a different Charles Sisco, who was born in Virginia in 1830, and appears as a laborer in the Delaware County, Pennsylvania home of a white male named George Williamson on the 1910 census.

On the 1900 census for Chester County, PA, is a Catherine Sisco, who was born in Virginia in 1822, and may have been married to a male surnamed Sisco, as she is a widow and lives alone in 1900.

I hope this is some help to you.