Conversation so far:
what was the capital of korea before the korean war
Seoul was the capital of various Korean kingdoms, including Baekje, Joseon, and the Korean Empire and served as the secondary capital of Goryeo.
what was the capital of korea under japanese occupation
When the Empire of Japan annexed the Korean Empire, it utilized Seoul as the colonial capital. While under colonial rule, from 1910 through 1945, the city was called Keijo.
what is the city of keijō called today
During the period of Japanese occupation, Seoul was named Keijō in Japanese or Gyeongseong in Korean. Its current name is Seoul.

Question: what other names are there
Self-contained rewrite: what other names for seoul are there besides keijō and gyeongseong