Actually those katakana characters read エ(eh)オ(oh)ル(ru)ゼ(ZAY)ア(ah). The katakana for "zi" (pronounced "zee") is something completely different, and technically doesn't exist in the Japanese alphabet normally. The closest approximation would be to compound characters, like they use to write the "Fah" in "Final Fantasy" by combining フ(fu) with a small ァ(ah) next to it (ファ).

The more you know~