User blog comment:B214/Talk About What You Want! 3/@comment-16281343-20150106125054

Finally found the proof (well, not that hard to do it. just a simple search) that it is Sirzechs not Sir Zechs.

For those who do not know and haven't visited Sirzechs' page or read the trivia on the front page:

"Sirzechs' name is derived from the names of two characters from the Gundam TV series, Char Aznable of Mobile Suit Gundanm 0079 and Zechs Marquis of Mobile Suit Gundam Wing.
 * Char Aznable -> Shaa Azunaburu
 * Zechs Marquise -> Zekusu Mākisu
 * Sirzechs -> Sāzekusu"

Fun Fact and a trivia stumbled when searching for the proof.

"Millicas' name is derived from the original names of the characters used for Sirzechs' name:
 * Milliardo Peacecraft is Zechs' original name.
 * Casval Rem Deikun is Char's original name."

So, yeah. Father and son's names are connected.