No need to apologize for citing the “original” RDA. That’s still what PCC is using for the next couple of years.
Also on point for this question is 126.96.36.199, especially 188.8.131.52.2. If a part of a name functions as a surname, record it as a surname.
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In each of the examples you cite, the form of name has been correctly entered according to RDA (and according to AACR2, for that matter), so I don't think it would be correct to say that our practice has been inconsistent.
Tina Louise and Rose Marie are entered under their first names because they have chosen not to use a surname when presenting to the public. Persons whose preferred form of name does not include a surname are covered under RDA 184.108.40.206 (my apologies for citing an instruction according to the "old" RDA -- I am not comfortable yet referring to the the Toolkit--).
Jon Stewart chooses to present to the public under the name Jon Stewart. "Stewart" is commonly perceived to be a surname, so he is entered under "Stewart".
I think it is correct to treat "Brie" as a surname, since most people would probably not perceive it to be a given name. (there are many other instances in the National Authority File of "Brie" as a surname.) I note that in her Wikipedia entry, her "form of entry" is Alison Brie, with the fuller form Alison Brie Schermerhorn only appearing in the body of the entry. Her existing authority record (no2011164114) could certainly be fleshed out with this additional information, i.e.
100 1_ Brie, Alison
400 1_ Schermerhorn, Alison Brie
In each case, the form of name has been established according to our foundational principle that the basis of a heading is the form of name by which a person is best known (RDA 220.127.116.11, "When choosing a preferred name for person, generally choose the name by which the person is commonly known")
To address the point that Hank mentioned, the first indicator of the 100 is used to indicate whether the entry element is a first name (1st indicator zero) or a surname (1st indicator 1).
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Subject: [External] [PCCLIST] middle names as last names
Sometimes we file people under their first name when they are using their middle name as a last name:
100 0 Tina Louise, ǂd 1934-
670 Halliwell's filmgoer's comp., 1988 ǂb (Louise, Tina; b. 1934; AKA Tina Blacker; actress)
100 0 Rose Marie, ǂd 1923-2017
670 Internet movie database WWW site, April 13, 2004 ǂb (Rose Marie, aka Rose Marie Mazetta, aka Baby Rose Marie; b. Aug. 15, 1923, New York, N.Y.)
And sometimes we don't:
100 1 Stewart, Jon, ǂd 1962-
670 IMDb, Apr. 16, 1998 ǂb (Jon Stewart, b. Jonathan Stewart Leibowitz, Nov. 28, 1962; actor)
100 1 Brie, Alison
670 Wikipedia ǂb (Alison Brie Schermerhorn (born December 29, 1982) is an American actress)
I suspect it's a case of whether we knew their real names at the time. Going forward, and preferably going back, can we have some consistency? While the first two examples are technically correct, their real names are more trivia than helpful navigation.
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