Originally Posted by
Zatheyll
Titan:
1. Greek Mythology One of a family of giants, the children of Uranus and Gaea, who sought to rule heaven and were overthrown and supplanted by the family of Zeus.
2. titan One of prodigious size, strength, or achievement: "the twin titans of the beverage industry" (David Barboza).
3. A satellite of Saturn.
Titan is more referred to as a celestial being of great importance that creates and rules.
eoten m
giant, monster
Something more devious and destructive.
Which is what they are in SnK.
進撃の巨人 known as Shingeki no Kyojin in romanji directly translates to "Advancing Giants" or even more literally "Advance/Charge on Giant/Great Man". Shingeki for Advance or Charge and Kyojin for Giant or Great Man. Giants were known as Eoten in Proto-Germanic.
Titan comes from Greek Mythology. You could also say Eoten makes more sense because the setting is far more Germanic than Greek. Not greek at all really and almost fully germanic.
tl;dr - cause you care and i'm bored I guess