The IUPAC has released proposed names for the four remaining unnamed elements this morning:
Element 113 - Nihonium - Nh
Element 115 - Moscovium - Mc
Element 117 - Tennessine - Ts
Element 118 - Oganesson - Og
Tennessine gets an "ine" ending because the other elements in it's column do (Flourine, Chlorine, etc).
Oganesson gets an "on" ending because the other elements in it's column have that ending (Neon, Argon, Krypton, etc).
Full article here:
http://iupac.org/elements.html