`Liam Ó Murchú` reads `Ó` as a middle initial: add the Irish particles `Ó`, `Ní`, `Ua` (and Malay `binti`)

[derek73]

Rationale

Irish surnames are written with a separate patronymic particle: Ó/Ua ("descendant of"), Mac ("son of"), Ní/Nic ("daughter of"). mac is already in the particle vocabulary, but ó, ní and ua aren't. So the particle is read as a middle name and the surname loses its first word:

Liam Ó Murchú       → given Liam, middle Ó,  family Murchú
Sinéad Ní Mhurchú   → given Sinéad, middle Ní, family Mhurchú

Malay has the same shape with bin/binti ("son of"/"daughter of"). bin is a particle; binti isn't, so Ina binti Navalamar → middle binti, family Navalamar, while Hasim bin Hassan → family bin Hassan.

Found while reviewing NameAPI's published demo examples and its culture notes on Irish and Malay names.

Statement

• ó, ní and ua join PARTICLES as never-given particles. None is a standalone given name, so a name they open is surname-only, as with de Mesnil (rules.md#P1).
• binti joins as an ambiguous particle, like bin, because Binti is also a given name (Swahili, "daughter").
• Ó. written with a period stays an initial. The Irish particle is never written with a period, but Ó. is a real initial (Spanish Óscar, Icelandic Ólafur/Óskar/Ólöf). Today the particle match normalizes edge periods away, so ó in the vocabulary would also claim Ó.. The fix needs a particle that matches only when written bare. That's new: no one-letter particle has existed before, so nothing has needed it.

Examples (measured; "proposed" uses a temporary Lexicon.add)

input	now	proposed
Liam Ó Murchú	middle Ó, family Murchú	family Ó Murchú
Sinéad Ní Mhurchú	middle Ní, family Mhurchú	family Ní Mhurchú
Seán Ua Buachalla	middle Ua, family Buachalla	family Ua Buachalla
SEÁN Ó MURCHÚ	middle Ó	family Ó MURCHÚ
Ó Murchú	given Ó, family Murchú	family Ó Murchú (P1)
Ó Murchú Liam (FAMILY_FIRST)	—	given Liam, family Ó Murchú
Ó Murchú, Liam	family Ó Murchú	unchanged (the comma already settles it)
Ina binti Navalamar	middle binti	family binti Navalamar
Siti Nurhaliza binti Tarudin	middle Nurhaliza binti	middle Nurhaliza, family binti Tarudin
Binti Jua	given Binti, family Jua	unchanged, reports particle-or-given
Juan Ó. Pérez	middle Ó.	must stay middle Ó.. Naive vocabulary gives family Ó. Pérez
J. Ó. Pérez	middle Ó.	must stay middle Ó.. Naive vocabulary gives family Ó. Pérez

The last two rows are the boundary the bare-only matching has to hold. They make good case-table rows, contrasted with Juan Ó Pérez.

Accepted consequences

• Bare Juan Ó Pérez (an Óscar initial written without its period) becomes family Ó Pérez. Accented initials normally carry the period, so this should be rare.
• Ó as a whole given name stops being possible in leading position. It isn't one in any culture I found.

Open questions

• Should ua be never-given or ambiguous? I found no given-name use, but checked less thoroughly than for ó/ní.
• Should binte (the Singapore spelling) come along with binti? I'd leave out the abbreviations bt/bte: two-letter words, and unreviewed.
• Interaction with Mc Donald and Ste Marie read the particle as the given name #360, which questions the never-given set's membership: these three would be its first additions since that issue was filed.

Exclusions

• nic: it's also an abbreviation of Nicolas/Nicole and a given name in its own right (Nic Cage). It belongs in an opt-in Irish pack, not the defaults.
• Unaccented O: Liam O Murchú is unchanged (middle O). Bare O is a common initial written without a period, and anglicized Irish names write O' glued to the name anyway (O'Neil already parses).

Same-PR obligations

rules.md P amendment for the bare-only boundary; a decisions.md#vocabulary-collisions application entry for the four words; case-table rows for each example, including the Ó. contrast.