Should Sri Lanka's parliamentary titles in Sinhala and Tamil script be vocabulary? (ගරු අජිත් ගිහාන් මහතා, පා.ම. gives given පා.ම., family ගරු අජිත් ගිහාන් මහතා) #1244

Sri Lanka's Parliament writes each member's name in English, Sinhala and Tamil, in one fixed form per language (parliament.lk's member list, /{en,si,ta}/members-of-parliament/mp-listing):

The English form reads right. In the other two, none of the words around the name is in the vocabulary, so the M.P. after the comma becomes the given name and the whole name, titles included, becomes the family (measured on master ccaf6ad):

All 225 current members read this way in each script (450 of 450).

The words, counted over the 225 members of each list:

si.toml holds only Latin de and ජූනියර්; ta.toml holds thiru (excluded) and three generation words. None of these words is listed in any file.

What listing them would do: in a lexicon of my own (the M.P. words as credentials written without their periods, පාම and பாஉ, the way en.toml writes mp; the front words and the bracketed ones as titles; මහතා, මහත්මිය, මෙනවිය as courtesy suffixes), all 450 rows read with the title, given name and family that the English list gives.

Questions

• Should these go in si.toml and ta.toml, or only into a Sinhala and Tamil choice? None of them looks like a name, but I haven't checked bearer counts in native script (tools/name_usage.py can't count Sinhala or Tamil spellings).
• මහතා (Mr.) comes after the name. Is it a courtesy suffix like rinpoche, or a salutation that ends the name, like the after-given titles (H8)?
• The bracketed titles have no period, so they read as nicknames. That is Should Maria Rossi (Sig.ra) read the salutation as a title, as Maria Rossi Sig.ra and (Dott.ssa) do? #1132's class (Maria Rossi (Sig.ra)): does listing them as titles settle it here, or does it wait on Should Maria Rossi (Sig.ra) read the salutation as a title, as Maria Rossi Sig.ra and (Dott.ssa) do? #1132?
• නීතිඥ and சட்டத்தரணி mean "attorney" before the name; English writes it after the name, which is Should Attorney at Law after a comma read as a credential? (Hiruni Wijesinghe, Attorney at Law, M.P. gives given 'at', family 'Hiruni Wijesinghe') #1243.