Jazz sits next to 4 phonetic neighbors — Jaz, Jas, and Jace are the closest matches by sound. Most share Jazz's American English slang-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"energy, spirit, vigor"
"wide meadow, wide island"
"from the third settlement"
"young male, beloved son"
"short form of Isaiah"
"thicket, small wood"
"little battle, warrior spirit"
"palm tree, upright"
"the fast one, arrow"
"small place of worship"
"son of Hutch (Hugh)"
"strength"
"merchant, trader"
"beloved (possibly influenced by love)"
"small deer"
"priest"
"Yahweh remembers"
"moonlight, lunar"
"spirit of battle"
"strong, powerful"
"eternal, everlasting"
Similar sound: These names share phonetic patterns with Jazz — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have American English slang origins, giving them the same cultural heritage as Jazz.
Rhythm: Jazz is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.