These are the main surnames I am researching:

DEVLIN - Mary DEVLIN was born 1830 in Scotland. Her father Frank DEVLIN and mother (Sarah?) were both born in Scotland according to 1880 Census. Don't know when she arrived in the U.S., but she was listed on the 1880 Census as living in Hanover Township, Pennsylvania, with her husband Andrew RUDDY and their children.

GALLAGHER - My grandmother, Theresa (Grace) GALLAGHER was born in 1873 in Magheralosk, in the townland of Meenaduff, County Donegal, Ireland. Her father was Manus GALLAGHER and her mother Mary MCGARVEY. Theresa came to the U.S. in 1894, according to the 1910 Census. She married Andrew J. MULHERIN in 1900 in Pittston, Pennsylvania. They had 5 children.

McGARVEY - Mary MCGARVEY, my great-grandmother on my mother's side, was born 1841 in Magheralosk, in the townland of Meenaduff, County Donegal, Ireland. She married Manus GALLAGHER in 1870 in Magheralosk. Mary and Manus had 6 children. Mary died there in 1910.

MULHERIN/MULHERN - Several variations of this name, including MULHEARN. My MULHERIN immigrant ancestor was Peter MULHERIN, who came to the U.S. from County Donegal, Ireland, where he was born in 1841 in the Killybegs area. He arrived with two brothers, John and Patrick, and settled in the Wilkes-Barre, Pennsylvania area. Peter married Sarah RUDDY about 1871.

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RUDDY - Sarah Agnes RUDDY was born in Scotland in 1850. I haven't located the town she was born yet, but her sister Ellen (Helen) was born in Lanark, Scotland in 1857, and her brother Francis (Frank) was born in Lanark in 1860. Sarah's father Andrew RUDDY was born in Ireland, and her mother Mary DEVLIN was born in Scotland. The 1900 Census lists Sarah's year of immigration as 1864. She married Peter MULHERIN about 1871, and had 9 children.