man-weɳ
The final nasal is a retroflex sound ʼɳʼ.
In Gundjeihmi you drop the m off— an-wern

man- / an- 'noun class prefix vegetable class', -wern 'many'

You can also use other prefixes on the stem -wern, such as those that refer to people (pronominal prefixes). This is what linguists would call a predicate usage, like this:

birri-wern (Kunwinjku)
barri-wern (Gundjeihmi)

You can also incorporate a noun into words like this to give:
Nga-mok-wern 'I have many sores' — literally 'I-sores-many'.

duruk na-wern 'many dogs'
man-me man-wern (W) / an-me an-wern (Gdj) 'a lot of food'
murrikang man-wern 'many cars'
kun-mayali kun-wern 'a lot of knowledge/ideas'