As in this post, there are some standing name discrepancies for Code Geass.
Aliasing charles_di_britannia -> charles_zi_britannia.
Aliasing diethard_reid -> diethard_ried.
Aliasing lakshata_chawla -> rakshata_chawla.
Aliasing odysseus_u_britannia -> odysseus_eu_britannia.
Aliasing gilbert_guilford -> gilbert_gp_guilford/gilbert_g_p_guilford.
My primary source is the English R2 page, since the Japanese site(s) tend to not carry 'last' names, if any at all.
EDIT: Our wiki had kanon_maldini, but the tags use kannon_maldini, with no alias.
Curiosity: Is Shinozaki Sayoko her actual name? The site I linked has "Shinozaki" as her fighting style, but I don't know any Japanese to tell otherwise.
Updated by Soljashy