Moon sits next to 3 phonetic neighbors — June, Lune, and Dune are the closest matches by sound. Most share Moon's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"the moon; lunar"
"little salmon, little goad"
"heart, courageous heart"
"watchful, alert, awake"
"son of Jeffrey, son of peace"
"narrow strait, channel"
"heather-covered hill"
"ash tree farm, settlement by ash trees"
"son of Oda"
"one who protects"
"precious, greatly valued thing"
"Yahweh is God"
"bold undertaking; risky journey"
"people of warmth"
"victory of the people"
"invented modern variant"
"lord, respected elder (if from Sire)"
"modern invented name"
"sight, ability to see"
"bold land"
Similar sound: These names share phonetic patterns with Moon — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have English origins, giving them the same cultural heritage as Moon.
Rhythm: Moon is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.