Mostly from Ireland and Scotland, but I also have a few other family immigrants as per a list I've been working on from time to time.Do not certify the accuracy and if someone has some additions or corrections, please so note.
This just might clear up some confusion as to some of the family founders, though it might also raise some additional questions.
Alexander's From North Ireland, Scotland and England…
Names of immigrants; country emigrated from (NI = Northern Ireland, Ireland or Scotland) then, state to which they immigrated to, and finally, approximate year of immigration.
Adam & Louisa Schmidt Alexander Scotland to Georgia ~1800
Andrew & Agnes Graham Alexander NI to Maryland ~1660
Andrew & Ann Taylor Alexander NI to Maryland, then Virginia & North Carolina c1670
Andrew & Catherine Stuart, Scotland to Virginia, c1750
David & Charlotte ____ Alexander Scotland to Grand Island, Nebraska, 1884
David Alexander Family NI to Maine ~1700
George & Jane McCord Alexander, NI to North Carolina (appears that Jane was born in NC, but removed to NI, where she md. George)
George Alexander, Scotland to Massachusetts c1640; he md. Susan Sage (b. England) in Windsor, Connecticut, 1642
Hugh & Charlotte Lambertson Alexander Ireland to Iowa 1830-1840
Jacob & Mary Smith Alexander NI to South Carolina sometime in the 18th century.Jacob was born in either Ireland or Germany, but his father, Johann Friedrich Alexander, and mother, Anna Fuchs, were German.
James & Mary Steele Alexander, NI to New Castle, Delaware, then Maryland c1700
James & Hanna Alexander, NI to PA prior to 1750; note: one of his descendants, John Romach Alexander & his wife, Carrie Elder, were Presbyterian missionaries in Egypt; thus, their children were born there but all returned to the US, though John & Carrie died in Egypt
John & Catherine Graham Alexander Scotland to Virginia 1670-1680
John & Jane Dunlap Alexander, County Cork, Ireland to Maine c1800
John & Margaret Glasson Alexander, NI to New Castle, Delaware or Philadelphia, PA 1736
John & Mary Montgomery Alexander ** Scotland to Canada, then Ohio & Illinois 1842
Joseph Alexander (wife Abigail McKnight, b. USA), NI to Maryland, early 1700s
Joseph (wife: Frances Malone, b. USA)Ireland to PA 1780
Joseph (wife: Sarah Poole, b. in USA)Scotland to South Carolina, then Georgia 1825
Oliver Alexander & Family NI ?? to Maryland 1730-1740
Phillip Alexander, b. Scotland or NI, imm. to America c1700, married Joanna Roberts in 1710 in Massachusetts
Robert & Priscilla++ Ashton Alexander Scotland to Virginia ~1650-1660
Robert Alexander, NI to Virginia, c1730, where he md. Esther Beard
Robert & Eliza Hunter Alexander England to PA (1880), Ohio (1886), then Michigan(1900)
Samuel & Mary Taylor Alexander NI to Maryland 1650-1660
William (Wife, Martha Alexander, b. USA) NI to PA ~1720
William (Wife, Eliz Duffin, b. Canada) Alexander NI to Canada (1865), then North Dakota, c 1900
William (wife, Maria Hall, b. USA) Alexander Scotland to Ohio, then Iowa ~1840
William & Agnes Alexander NI Maryland, then North Carolina 1725
++Priscilla or Frances Ashton
**John Alexander: Born in Kent, England; Mary was born in Scotland. They married in Scotland
Thomas Alexander, a native of Naples, Italy, removed to LA about 1790-1795; I believe he was of Scottish heritage. Many Alexander's of LA are descended from him.
Antonio Silveira Alexander, born in the Azores, came into CT about 1880-1890; many Alexander's of the East Coast are related to this man.
Charles Alexander immigrated from Hungary c1890-1900 to Massachusetts
Another Charles Alexander immigrated from Russia c1900 to NY. He was Jewish.
Manuel C. Alexander (1826-1879) was the son of Joao Alexandre, was born in the Azores and came to America, first to Massachusetts, then Sonoma County, CA