ribu

From Proto-Malayo-Polynesian *ʀibu. First attested in the Kedukan Bukit inscription, 683 CE, as Old Malay [script needed] (rivu), in the form sarivu (current spelling seribu). Old Cham cognate form saribu also attested in the Đông Yên Châu inscription of the 4th century.

Also theorized to be late enough to be borrowed from Arabic رِبْوَة (ribwa) which meant “myriad” in reference to a currency.

ribu (Jawi spelling ريبو)

Potet, Jean-Paul G. (2013) Arabic and Persian Loanwords in Tagalog, Lulu Press, →ISBN, page 192

Serbo-Croatian edit

ribu

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

ribu

Inflection of ribu (inflection type 1/ilo)
nominative sing.	ribu
genitive sing.	ribun
partitive sing.	ribud
partitive plur.	ribuid
	singular	plural
nominative	ribu	ribud
accusative	ribun	ribud
genitive	ribun	ribuiden
partitive	ribud	ribuid
essive-instructive	ribun	ribuin
translative	ribuks	ribuikš

inessive	ribus	ribuiš
elative	ribuspäi	ribuišpäi
illative	ribuhu	ribuihe

adessive	ribul	ribuil
ablative	ribulpäi	ribuilpäi
allative	ribule	ribuile

abessive	ributa	ribuita
comitative	ribunke	ribuidenke
prolative	ribudme	ribuidme

approximative I	ribunno	ribuidenno
approximative II	ribunnoks	ribuidennoks
egressive	ribunnopäi	ribuidennopäi

terminative I	ribuhusai	ribuihesai
terminative II	ribulesai	ribuilesai
terminative III	ribussai	—

additive I	ribuhupäi	ribuihepäi
additive II	ribulepäi	ribuilepäi

Zajceva, N. G., Mullonen, M. I. (2007) “бахрома”, in Uz’ venä-vepsläine vajehnik / Novyj russko-vepsskij slovarʹ [New Russian–Veps Dictionary]‎^[1], Petrozavodsk: Periodika

ribu