Jetiise Vod Be Gra'tua Bal Ijaa was the title given by the Mandalorians to Nathaniel Kenobi Solo after he officially joined them during the Alliance-Confederation war. It was Mando'a for Jedi brother of vengeance and honor. It showed that the Mandalorians respected Nathan's better-known qualities of being honorable and avenging wrongs.
Nathan loved the name and even used it as a pseudonym sometimes when he was undercover. He sometimes signed documents with the initials JVNGBI to signify that he still identified himself sometimes as a Mandalorian. Jaki Grawn referred to him by this title whenever she talked to him.