If you downloaded scum-scans vol.10 ch.78 on the character intro there was an explanation about Sano's nick name being Aeon Clock.
*Plus from what I've edited on vol.15 it does say Aeon Clock on his name :P
Thank you for sharing.
For those who are interested, here is the full explanation of why it was changed to "Aeon Clock".
Ah since I just copy and pasted I have the spelling wrong, but the author him self wrote his name in eglish as "Yasuyoshi Sano as Aion Clock" on vol. 15, I have the copy but I cannot post the pic :P
thanks for the fast scans :) at this rate we might be able to catch up with the raw.