Zion sits next to 3 phonetic neighbors — Orion, Lion, and Silas are the closest matches by sound. Most share Zion's Hebrew-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"highest point, citadel of Jerusalem"
"the river Jordan"
"little red-haired one"
"God will increase, he will add"
"ruler of the home"
"fortunate, prosperous"
"consecrated; worthy of reverence"
"son of the valiant one"
"son of David"
"from the city of Milan"
"rest, comfort"
"truly brave, genuinely bold"
"he gave, gift from God"
"gift of Yahweh"
"Poecc's estate; Poecc's settlement"
"grey home, gravelly homestead"
"helpful; assistant; descendant of the helpful one"
"from the people (damos)"
"battle, companion"
"valley dweller"
"praised, thankful"
Similar sound: These names share phonetic patterns with Zion — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew origins, giving them the same cultural heritage as Zion.
Rhythm: Zion is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.