-u-

it, m class_(III)/u class_(XI) object concord
- 18th century, Abdallah bin Ali bin Nasir, Al-Inkishafi‎^[1], stanza 13:
  اَوُرَكِيْبُوُ جُوَ نِمَاسِ ، كَكُلَ خَسَرَ اُخَسِرِيِ
  Aurakibuo jua ni-mwasi, kwa-kula khasara ukhasiriye.
  The one who rides it, know you are a rebel; you harm yourself.

Swedish

In almost all words from Old Swedish -u, -o, from the Old Swedish genitive form of Germanic feminine ōn-stems.

Alternates with -o- according to Old Swedish rules of syllable weight, where -o was used after heavy syllables and -u after light.

-u-

Used as interfix in compounds with some old weak feminines with a former light syllable ending in -a. Some common ones are gata (“street”), e.g. gatukontor (“highway department”); lada (“barn”), e.g. ladusvala (“barn swallow”), etc.
Alternates with a zero interfix (vowel deletion) in some words, cf. gatukontor (“highway department”), but gatlykta (“street lamp”).
The interfix was formerly mostly confined to the written literary language, whereas the spoken colloquial language preferred compounds with no -u- or with -e- in some dialects, cf. dated stugudörr with modern stugdörr, and the common pronunciation lagård for ladugård (“barn”). However, for some words, -u- is common in compounds even in the modern spoken language.

Teleman, Ulf; Hellberg, Staffan; Andersson, Erik & Holm, Lisa (1999). Svenska akademiens grammatik 2 Ord. Stockholm: Svenska akad.
Wessén, Elias (1958). Svensk språkhistoria. 2, Ordbildningslära. 3. ed. Stockholm: Almqvist & Wiksell

class	subject concord		object concord	relative
class	affirmative	negative	object concord	relative
m_(I)	a-, yu-	ha-, hayu-	-m-, -mw-, -mu-	-ye
wa_(II)	wa-	hawa-	-wa-	-o
m_(III)	u-	hau-	-u-	-o
mi_(IV)	i-	hai-	-i-	-yo
ji_(V)	li-	hali-	-li-	-lo
ma_(VI)	ya-	haya-	-ya-	-yo
ki_(VII)	ki-	haki-	-ki-	-cho
vi_(VIII)	vi-	havi-	-vi-	-vyo
n_(IX)	i-	hai-	-i-	-yo
n_(X)	zi-	hazi-	-zi-	-zo
u_(XI)	u-	hau-	-u-	-o
ku_(XV/XVII)	ku-	haku-	-ku-	-ko
pa_(XVI)	pa-	hapa-	-pa-	-po
mu_(XVIII)	m-, mw-, mu-	ham-, hamw-, hamu-	-mu-	-mo