Jupiter sits next to 3 phonetic neighbors — Jupiter, Juniper, and Jasper are the closest matches by sound. Most share Jupiter's Proto-Indo-European-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"sky father, father of gods"
"son of Ellis"
"son of the spear-ruler (Gerald = Geirald)"
"descendant of Caiside"
"gift of God"
"strong; speckled one"
"blond, yellow-haired"
"highest point, fortified hill"
"reed clearing"
"descendant of the hound of valor"
"gift of Yahweh"
"defender, protector, warrior"
"renowned in battle"
"lord, master"
"Isle of Skye, Scotland"
"son of the home ruler"
"slender one, the thin one"
"eighth"
"variant of Nathan: God has given"
"land of the Indians"
"fortified camp, military settlement"
Similar sound: These names share phonetic patterns with Jupiter — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Proto-Indo-European origins, giving them the same cultural heritage as Jupiter.
Rhythm: Jupiter is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.