Yuuki's mother turned to Catholicism after learning about her and her family's affliction. This much I'm pretty sure was mentioned in the anime, and it left a strong impression on Yuuki herself.
The author said the skill name is a memento to her mother. (I'll need to find the exact quote later, but it was an answer to a fan's question on Twitter) He used "Rosario" instead of "Rosary" because the Japanese loan word was taken from Portuguese. A rosary itself is a set of prayers called "Hail Mary's". There are also ornaments like necklaces or rings with specific beads for counting the Hail Mary's, also called Rosaries. While it may be speculative, I also think that each hit from the 11-hit skill by Yuuki represents a physical rosary's components, as the typical rosary has ten beads each to represent a Hail Mary, plus a crucifix.
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Best Answer
2 years ago
In the second season of Sword Art Online, Yuuki had an 11-hit Original Sword Skill. She passed it down to Asuna before she died. She named the skill, "Mother's Rosario".
Can anyone tell me what exactly is Rosario supposed to mean? I would like to know what it literally means and what it means in the current context and if there is any history behind the word.