It is probably related to Muong,
It consists of a large Cantonese (?) superstratum imposed on a strong Vietnamese substratum resulting in modern "Sino-Vietnamese" language of Vietnam.
Strong example is the numerals.
Viet-Muong languages (North Mon-Khmer):
Vietnamese
- Code: Select all
một hai ba bốn năm sáu bảy tám chín mười
Muong
- Code: Select all
mộc hal ba bốn tam kháu bay sám chín mười
May
- Code: Select all
moic hal pa pón dâm ráw pậy thám chín mɨèy
Thavung
- Code: Select all
muut haal paa póon dam phalủ pih sáam chíin sip
Arem
- Code: Select all
muty hei̛ pe puôn dhâm prau pơ thảm chín mươi
East Mon-Khmer languages:
Khmer
- Code: Select all
múuey piir bèey bùuen pram pram-múuey pram-py̛l pram-bèey pram-bùuen dap
South Mon-Khmer languages:
Mon
- Code: Select all
mòa bả pỏ̤ə po̤n pəso̤n kərao həpo̤h həcham həchit cho̤h
To compare, I will include some Sino-Tibetan languages too.
Middle Chinese
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iêt8 ñzhi6 sâm2 si6 nguo4 lyuk8 tsˈyet7 pwat7 kyəu4 zhyəp7
Classical Tibetan
- Code: Select all
gchig gñis gsum bzhi lnga drug bdun brgyad dgu bchu
Tangut
- Code: Select all
ləw nɨⁿ sɔ ƚɪr ngghʉ̲̀h tshhiew shɑ ʔyar nggʷɨⁿ ʔyir
Classical Burmese
- Code: Select all
tac hnac sùm lè ngà kˈrok hnac hrac kò cˈay
And also, just for good measure, some other Asian languages.
Proto-Tungus
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*ämün *zhör *ilan *dügün *tuñga *ñöngün *nadan *zhapkun *xüjägün *zhuwan
Proto-Yukaghir
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*ərq *kil *yal *yaleql *ekonsh-kumneldh *meldhal *pirskiy *maldhaleql *kildh *kumneldh
Proto-Chukchi-Kamchatkan
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*ennan *ngighaq *ngeghoq *ngeghaq *melhengen *enna-melhengen *ngigha-melhengen *ngegho-melhengen *ngeghaq-melhengen *mengyetken
Ket
- Code: Select all
qogd inang doong siing qaang as ons inaem-bynsang-qus qusaem-bynsang-qus quus
Nivkh
- Code: Select all
ñi mi ce nə tho ngax ngamg minr ñəñben mxo
Korean
- Code: Select all
hana tul set net tasöt yösöt ilgop yödöl ahop yöl
Proto-Ainu
- Code: Select all
*siné *tu: *dé *iiné *aski *iihdan *adéhdan *tupédhdan *sinépéhdan *hdan
Proto-Japonic
- Code: Select all
*p'tö *p'ta *mit *yöt *itu *mut *nana *yat *kökönö *töwo
Hmong
- Code: Select all
ib ob peb plaub tsib rau xyaa yim cuaj kaum
Proto-Tai
- Code: Select all
at22 ji:h22/15 sa:m15 si:h22 xè:51 xok44 chet44 pɛ:t11 kao22/51 dzhip44
Some of these look conspicuously close to Sino-Tibetan: Proto-Tai for example closely mirrors Sino-Tibetan numerals.
