McKain on Family Tree Circles

William and Catherine Burney McKain came from Ireland in 1837 with
their son William B. and daughter Catherine was born on the sea in 1837. In the 1840,1850 US census they are in Cedar Ward, Philadelphia,Pa. under the Name McKean. Four more members were born
in Philadelphia: John-b.1839, James-b.1843, David-b.1844 and Hester-
b.1849.
We feel his brother Samuel and Nancy(Bovard) McKain with their son John-b.1834
arrived from Ireland 1835 and live in Cedar Ward,Philadelphia,Pa. also.
Our Barber connection? Possibly our Catherine McKain b.1839 Ireland
as we saw it, maybe our Catherine b.1837 on the sea.
Son Wm.B. later changed his name to Cain prior to 1860.
We are also trying to locate where in Ireland both William and Sam came from and are they brothers?