Originally Posted by
sachiko
It's really no big deal, but sachi is like half a name. East Asians don't name kids by how it sounds. The names actually mean something depending on the kanji used. Sachi can mean different things, but the kanji my mother used means "of happiness." The ko means "child," so I am "child of happiness." It reflects my mother's feelings. But, like I said, no big deal. Just thought I would let you know.

Don't feel too bad, people shorten names on forums all of the time.
For example, my name is Nomercy448. It means "doesn't like people." People shorten that online all of the time to "Mercy," which I understand means something completely different.