# There is no salvation in any other person

"He is the only person who is able to save"

# no other name under heaven given among men

"no other name under heaven that God has given among men" 

# no other name ... given among men by which

"no other person under heaven, who is given among men, by whom"

# under heaven

"in the world"

# by which we must be saved

"which can save us" or "who can save us"