User blog comment:B214/Question and Answers 3/@comment-74.110.108.150-20140911114349/@comment-73.178.133.185-20140912014516

Most of these "second names" are direct translations of the kanji given for their names. Because each kanji has multiple potential readings, they may receive a kana "ruby/rubi" (not the gem; look it up on wikipedia or something) in order to establish the corrent pronunciation, which happens most prominently in names. In the case of the Sacred Gear names, this 'pronunciation guide' appears as hiragana transliterations of "English names" that are the primary names used by the translations. The actual kanji rarely translate to the desired name, nor even have an obvious link to the name, but frequently have something to do with the actual power of the SG, or some other aspect like Boosted Gear being linked to the Red Dragon Emperor, Ddraig. (You wouldn't know Incinerate Anthem was related to the Holy Cross from the actual name, but its kanji more accurately hint at this).