Megaman fan here for the most part. 2 of my characters are named after Megaman characters, but I also have a character that is not named after Megaman stuff.

That said:

Ekkusu Volnutt -

Ekkusu is named after Japanese pronunciation of X from Megaman X. Volnutt is the last name of the Megaman from the Legends/DASH games.

Rokku Sigma -

Rokku is the Japaneses pronunciation of Rock from the Megaman games (used with the original Megaman and Megaman Volnutt). Sigma is the main antagonist from the Megaman X games.

Mikeru Takeuchi -

Mikeru was named after the Japanese pronunication of Mike, minus the A. Takeuchi is a Japanese surname.