The 1910 U.S. Census of Baltimore County, Maryland, city of Baltimore, 23 Ward, shows at 1004 S. Hanover Street
O'Greer, Alexander, Head, male white, age 35, married (1st) for 7 years, born MD, both parents born MD, occ: grocery store clerk, renting house.
[O'Greer] Minnie, Wife, 23, married (1st) 7 years, 1 child born, no children living, born Virginia, father b. Germany, mother Virginia
Note: The original handwriting in the census (viewed on microfilm) is very clear and the spelling of the surname is perfectly legible as "O'Greer."
1920 U.S. Census, Baltimore County, Maryland, 23 Ward, city of Baltimore, page 145, Address [looks like] 1218 Patapsco St.
O'Greer Alexander, Head, Renting, male white, age 45, married., b. Maryland, both parents b. Maryland, occ: Salesman, Commission House, wages
[O'Greer] Minnie T., Wife, 34
1930 U.S. Census, Baltimore County, Maryland, City of Baltimore, Ward 23, Block No. 17, en. dist. 4-370, page 267, address 1017 Charles Street
O Gerwer, Alexander, Head, Renting, $30, owns radio, male white age 55, married.age at 1st marriage 32. b. MD, both parents same, occ: Proprietor Commission House
[O Gerwer] Minnie, Wife, 45, married, 1st married at age 21, b. Virginia, father Germany, mother New York [sic]
Note: In 1930 the surname was written with the first letter separated by a space and no apostrophe, with the second part having been originally printed (by hand) as something which was overwritten and appears as Gerwer, but might be Grewer.Considering that the surname was so legible as O'Greer in previous censuses, it seems that the enumerator in 1930 is at fault for this peculiar misspelling.The information shown about Alexander and Minnie makes it clear that this is the same Alexander O'Greer family of the 1910 and 1920 censuses in Baltimore.
The USGenWeb Archives for Maryland included an abstract of a 1932 obituary or death notice from the January 15, 1932 edition of the Baltimore Sun newspaper showing that on Jan. 13, 1932, Minnie O'Greer (nee Holzbach) died; the wife of Alexander S. O'Greer.Mass was said at Holy Cross Church and interment was at Holy Cross Cemetery.
I have found no other O'Greers in Baltimore and so don't know anything about Alexander's heritage.The given name Alexander is common enough in certain Greer families, and I can't help wondering if Alexander S. O'Greer's father or grandfather used the name Greer, but somewhere along the line someone in the family in America decided it sounded more Irish with the O' added.If there was actually a group which from an early day called itself O'Greer, and not just Greer, it would be interesting to hear from anyone with knowledge of that group.