Aliasing nnoitra_jiruga -> nnoitra_gilga.
Reason: Official romanization of the name per this collage of excerpts from the latest Bleach databook.
The same image would also suggest the following aliases:
tesla -> tesra lindocruz
d-roy -> di roy rinker
apache -> apacci
sun-sun -> sung-sun
menoly -> menoly mallia
loly -> loly aivirrne
Since (except for probably Sun(g)-sun) are non-Japanese, non-Chinese names, official romanization from databooks would be the best.
Updated by a moderator