nihonium (Nh), moscovium (Mc), tennessine (Ts) and oganesson (Og), the newest elements atomic numbers 113, 115, 117 and 118.

So how named? - nihonium (Nh), moscovium (Mc), tennessine (Ts) and oganesson (Og), the newest elements atomic numbers 113, 115, 117 and 118. 

nihon means Japan in Japanese

Mosco is the capital of Russia. 

Tennessee is the state where Oak Ridge Is (and where Thorium power was first discovered as an aside)

And Oganesson recognises an individual.

"Oganesson, discovered by collaborating teams at the Russian Joint Institute for Nuclear Research and U.S.-based Lawrence Livermore National Laboratory, was named for professor Yuri Oganessian. The scientist, born in 1933, was a pioneer with achievements including the discovery of superheavy elements." Ref CNN