You might also be looking for Dr. Michael Okuda.

M. Okuda was a Human Starfleet officer in the 22nd century.

In 2151, he was listed as a Flight Software officer on the dedication plaque of Enterprise NX-01. (ENT: "Broken Bow", dedication plaque)

In 2154, he was a listed as a Spaceframe Engineering officer on the dedication plaque of the Columbia NX-02. (ENT: "Affliction", dedication plaque)

In January of 2155, he was listed as a MMACS officer on the directory placards at Starfleet Command's Fleet Operations Center, Sol Sector. His office was located in room #1210. (ENT: "Demons", directories)

This character was only mentioned in writing.
He was named after production staff associate Michael Okuda. There are other, later, members of the Federation's Starfleet that are also named for Okuda.