Not noticing any cries of "Please, send more work my way," I did what I could with the list of 1300-odd undifferentiated names that consist of more than $a. Many hundreds were found to be obviously incorrect on quick inspection and were changed. Many hundreds were found to be happily correct and of course were left alone. (I'm guessing the split was somewhere around 50%, in round numbers.) Some institutions have received private messages ...
I am very happy to report that every "undiffrerentiated" personal name that had both a birth date and a death date in its $d is now coded as "differentiated."
The following record (which remains unchanged) is I think the record-holder for an undifferentiated name with a date: three different people with the same name born in the same year. I present this just for the amusement of the group.
n 00044234 |a Smith, Michael, |d 1966-
Oh, OK, here's another interesting one. (The authority record is, as far as I can tell, just fine; I just think this is a fun example.) The item being cataloged appears to have been written at least in part to untangle two people of the same name who lived in the same country at about the same time. Of course, there's only one 600 in the bib record (LCCN 84213847) but the heading is established as undifferentiated because there are two people. Both of the "people" cite the same item in their respective 670s. The cataloger must have had a fun time with this one!
n 84132971 |a Aveiro, João Afonso de, |d 15th cent.
I'm left with a smallish pile of things that have an oddness about them but that I did not feel like attacking for one reason or another. In quite a few cases the record lacks "author of" 670s even though 008/32=b and I'm not competent to judge whether the record should have such fields added, or if 008/32 should be changed. In some cases there's a more exact birthdate available but I felt a bit squeamish about splitting things apart, mostly because of my deficiencies in the various languages. (I did do this in some other cases.) I have removed the editorial comments I had originally appended to each; if anyone wants to know why something is on this list, I'll be happy to discuss off-lline. Anyway: those who feel like it may have at these.
n 79059514 |a Ross, David A., |d 1936-
n 79075159 |a Martin, Michael, |d 1947-
n 79081745 |a Pollock, Jack, |d 1930-
n 79099392 |a Mayer, Peter, |d 1936-
n 79104810 |a Cousins, Anthea J., |d 1931-
n 81027344 |a Tangerud, Hans, |d 1929-
n 81058493 |a Mathieu, Jacques, |d 1940-
n 81060588 |a Baranov, N. N. |q (Nikolai Nikolaevich)
n 81060652 |a Yi, Won-yong, |d 1942-
n 81062047 |a Cao, Ming, |d 1913-
n 81062456 |a Hubmann, Hanns, |d 1910-
n 81090331 |a Li, Yu, |d 937-978
n 81103095 |a Chong, Sang-gu, |d 1925-
n 82039452 |a Lü, Guang, |d 1909-
n 82104535 |a Ito, Tadahiko, |d 1924-
n 82128190 |a Krichevskii, V. |q (Vladimir)
n 82223525 |a IAkovlev, A. I. |q (Aleksandr Ivanovich)
n 82254586 |a Mikhailova, I. A. |q (Irina Aleksandrovna)
n 83026901 |a Kim, Won, |d 1936-
n 83050758 |a Yang, Un-yong, |d 1947-
n 85206933 |a Suzuki, Mitsuo, |d 1926-
n 85233507 |a Ivanov, V. S. |q (Vladimir Sergeevich)
n 87920321 |a Yi, Ch'a-suk, |d 1927-
n 88162641 |a Sato, Akio, |d 1930-
n 88258539 |a Schmid, Josef, |d 1956-
n 88283486 |a Nguyên, Xuân Quang, |d 1941-
n 88605083 |a Bünker, Bernhard C., |d 1948-
n 89134710 |a Huang, Zheng, |d 1945-
n 92067647 |a Triêu Nguyên, |d 1947-
n 94122771 |a Becker, Jens, |d 1964-
n 96098625 |a Hunt, David, |d 1939-
no 00089652 |a Su, Shouzhong, |d 1941-
no 97021486 |a Nguyên, Thi Quy, |d 1951-
no2006120993 |a Ma'sumi, Ahmad ibn 'Ali, |d 11th cent.
no2010048644 |a Bulkeley, P. Z. |q (Peter Z.)
nr 92028730 |a Adler, M., |c Rabbi
nr 92029244 |a Ulloa, Luis Felipe, |d 1948-
nr 93023735 |a Sato, Tetsuo, |d 1955-
nr 95006966 |a Takahashi, T. |q (Toru)
nr 98000703 |a Egorov, V. N., |c doktor ekonomicheskikh nauk
nr 98019741 |a Trân, Hâu, |d 1954-
nr 99007626 |a Isachenko, G. A. |q (Grigorii Anatol’evich)