'Strays' in US Censuses?

Any of the following eleven people may possibly be 'strays' from clan families. If anyone has any clues to where any fit in, do please get in touch:

1840 Census:

James McElhagon, Ohio, Wood County, Troy Township;

1850 Census:

Bridget McHaggart, 23 (born 1827) Maine, Penobost County;

Maria McEllagan, 17 (b 1833) Ohio, Summit Co, Akron Twp;

1880 Census:

Edward McHago, 21 (b 1859) Iowa, Cass Co, Washington Twp;

Maggie McElagin, 16 (b 1866) New York, Franklin Co, Malone Twp;

1910 Census:

Hanna McElhaegg, 40 (b 1870) Pensylvania, Lawrence Co, New Castle, Ward 2;

Wm. E. McElage, 44 (b 1866) Ohio, Buller Co, Middletown, Ward 1;

1930 Census:

Roy McHaggart, 48 (b 1882) Oregon, Klanath Indian Reservation;

Baba McHa?go, 64 (b 1865) Indiana, Parke Co, Recoon Twp;

Mary McAllagay, 68 (b 1862) Illinois, Cook Co, Chicago City;

Mary McAllagay, 17 (b 1913) Illinois, Cook Co, Chicago City.