Sivan sits next to 4 phonetic neighbors — Sienna, Ivan, and Siobhan are the closest matches by sound. Most share Sivan's Hebrew-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"third Hebrew month (May-June)"
"father's joy"
"God is my father"
"Mount Carmel, garden place"
"beloved, wished-for child"
"spring of water, water source"
"pleasantness, beauty"
"azure, referring to the Azores islands"
"pure, beloved"
"wonderful, marvelous"
"Yahweh is gracious"
"lion of God"
"element in Yoruba compound names meaning blessed/noble"
"heard by God"
"gracious gift"
"God is my refuge"
"entertainer, evening companion"
"grace; God has favored me"
"dew of heaven, my dew"
Similar sound: These names share phonetic patterns with Sivan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew/Akkadian origins, giving them the same cultural heritage as Sivan.
Rhythm: Sivan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.