Germanic declensions?

Hi,

What is the (reconstructed I assume) Germanic nominative plural
equivalent of the latin -i, such as occurs in tribal names such as
Alemanni, Marcomanni, Marsi, etc.? In other words, what would tribal
names such as these have been in Germanic?

Also, would the Latin -ones ending in names such as the Teutones and
Semnones have been -aniz in Germanic.

And finally, what would the Germanic nominative singular equivalents
of Latin -us, -es and -is such as occurs in personal names have been?

-Michael
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