What does יו (yood+Vahv) mean at the end of a word? him? plural?

Answer 1

Yes and yes.

The suffix ו (Vav) indicates "his" possessive. The suffix ים (Yud Mem) and the suffix ות (Vav Thav) indicate plural, male or female.

The suffix יו (Yud Vav) indicates an object in a plural form that belongs to "him".

כובע: hat (male object)
כובעים: hats
כובעיו: his hats
נעל: shoe (female object)
נעליים: shoes
נעליו: his shoes

"her" plural object is יה (Yud Heh): כובעיה, נעליה
"my" plural object is יי (Yud Yud): כובעיי, נעליי
"our" plural object is ינו (Yud Nun Vav): כובעינו, נעלינו
"your (singular male)" plural object is יך (Yud Kaf): כובעיך, נעליך
"your (singular female)" plural object is יך (Yud Kaf): כובעיך, נעליך
"your (plural male)" plural object is יכם (Yud Kaf Mem): כובעיכם, נעליכם
"your (plural female)" plural object is יכן (Yud Kaf Nun): כובעיכן, נעליכן
"their (male)" plural object is יהם (Yud Heh Mem): כובעיהם, נעליהם
"their (female)" plural object is יהן (Yud Heh Nun): כובעיהן, נעליהן

Answer 2

What do you mean?
Do you know hibrit?
It's not for plural, beacuse it would be hei and nun or hei and mem.
And I don't think it's for he, because it ends with hei and vav (to be pronounced like hu)
I'm not sure what you're asking about. Come back with another question and more information to check it up. Best of luck