JamiroquaimEnglish (Modern, Rare) In the case of the band of the same name, which influenced first name usage in the 1990s and 2000s, they conceived it as a combination of jam and iroquai (the latter of the two is based on the Native American confederacy, the Iroquois).
JancisfEnglish (Rare) Blend of Jan 2 and Francis. This name is most notably borne by Jancis Robinson (b. 1950), an English wine critic, journalist and author who has won multiple awards for her work.
Jazzf & mEnglish (Modern) Diminutive of Jazmine/Jasmine or Jazper/Jasper, or possibly given in reference to "jazz", the genre of music, or the English word jazz meaning "energy, excitement, excitability; very lively; of excellent quality, the genuine article".