[derek73]

Closes #1097
Closes #1098

What moved

A new rule, P13 (a connective ending the name words), sits beside P6. It makes two joins before P3's three-word carve-out, in the part that holds the family name.

Input	1.4.0 – 2.8.2	this PR
John Smith y V	middle Smith, family y, suffix V	family Smith y V
Juan García y L.	middle García y, family L.	family García y L.
Puig i V, Joan	family Puig V, suffix i (to 2.6.0); family Puig, suffix i V (2.7.0 – 2.8.2)	family Puig i V
John Smith y III	middle Smith, family y, suffix III	family Smith y, suffix III
John Smith y VI	family Smith y VI	family Smith y, suffix VI
John Paul Smith y III	family Smith y III	family Smith y, suffix III
John Smith and Jr.	family Smith and Jr.	family Smith and, suffix Jr.

• A lone letter after a single-letter connective is the second surname it links. This covers a numeral or an initial, with or without its period. It applies with or without a comma, and to the Catalan i as well.
• A connective with nothing to link joins the word before it alone. This covers any connective written as a word, when only suffixes or a trailing title stand behind it. It no longer takes a suffix or a title as the name it links.

Decided in chat

• Family-first orders. Without a comma, the joins apply only under a given-first order, because there the end of the name is the family. The part before a family comma joins under every order.
• One-case names. These link a lone letter as their mixed-case twins do (JOHN SMITH Y V → family SMITH Y V). A cased single letter ending a one-case name keeps its reading. Every such name in the local corpora is an initial: CHENG GUI Y keeps family Y, and under FAMILY_FIRST reads middle Y.
• Rule home. Both clauses live in their own rule, P13, beside P6. P3 points to it.

Boundaries (case rows)

• Smith y V and Dr. Smith y V keep the carve-out. Where the part is the whole name, the joins leave a word in front, so the name keeps its given name.
• Smith y i V, John keeps suffix i V. This is a run of connectives. Count a family part's connectives out of its numeral count (#1093) #1095's S10 exception stays where P13 did not link the letter.
• Mr. John Smith and Mrs. stays a couple's formula. A word connective with a period-marked title right behind it is left to P3. John Smith and Jr. Mrs. still joins Smith and.
• John Smith & III is unchanged. A symbol is no word.
• John Quincy Smith i keeps suffix i. A generational connective with nothing after it stays the generation.
• John Smith Y keeps family Y. A capital letter in a mixed-case name is an initial (P8).
• A name typed decomposed (NFD) reads as its composed twin.

Rules amended

• P13 (new): both clauses, their exceptions, the precedence over P3 and over family-first orders, and the one-case Accepted bullet. Its Signal line carries a + case contrast, which marks it a split candidate.
• P3: the carve-out yields to P13, and the generational clause treats the letter P13 links as a name word.
• S10: a single-letter connective in front makes the letter a name word where P13 links it. The family-comma count keeps the generational connective P13 did not link.
• decisions: decisions/P13 is new. SUPERSEDED IN PART notes are added in decisions/P3 (Josep Carod i Rovira reads family Rovira — Catalan and Polish link surnames with i, which is not a conjunction #397 and Keep citation comments short: quote, clause, pointer #760), decisions/S10 (Should Smith y V, John keep the V in the family name, as Smith Jones y V, John does? #1093), decisions/C1, decisions/vocabulary-model and decisions/P9.
• Release log: one new bullet. The Why does "SMITH VD V, JOHN" lose the V from the family name when "SMITH V, JOHN" keeps it? #1080/Should Smith y V, John keep the V in the family name, as Smith Jones y V, John does? #1093 bullet's limits are scoped to particles.
• nameparser/AGENTS.md: a one-case lesson. A capital Y in a one-case name keeps its connective tag; only P8's marked letters read as initials.

Measured

The recipe is in decisions/P13; the base is 27298ec.

• Grid: 14,362 of 237,888 parses move: 8,686 under the default order and 2,838 under each family-first order, every family-first move in a part before a comma. No move leaves a name without a given or family name it had.
• Committed corpora: two rule examples move, Josep Lluis Carod i V and Smith i V, John.
• Cached local corpora: of the 38,349 names holding a connective word, 5 move.
  • 4 PatentsView surnames whose accented letter the source lost to a space: Lecouv e, Boll e, Bjerk y, B e. Each now keeps the surname whole.
  • 1 garbage FEC record: OF CHIPPEWA OF ND.
• Call cost: names with a connective that nothing joins pay 13–18 more Python calls (Mr. and Mrs. John Smith). That cost is constant per name and moves no benchmark guard. Names without a connective pay nothing.

Reviews

• First round: the design-docs, code, test and comment reviewers.
• Second round: a code review and a design-docs review of the fix commit, plus a focused review of the NFD and couple fix.
• /simplify: reuse, simplification, efficiency and altitude.

Each finding was fixed or recorded in the commit that follows it. The test review's mutants each fail a row, save the ones recorded as unreachable.

Checks

These pass: uv run pytest, uv run pytest -n0 -m serial, uv run --python 3.15 pytest, uv run mypy and uv run ruff check.

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