Amminadib = "my people are willing"

1) an unknown person noted for the swiftness of his chariots

1a) possibly not a person but should be translated 'my willing people'

Combined with am (עַם "Ammi" H5971)

Root √עמם: עָמַם

עַם עָם n.m people a people nation , = smaller units = common people people persons in gen. phrases ,1810.