Joan sits next to 3 phonetic neighbors — Jean, June, and Jane are the closest matches by sound. Most share Joan's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"God is gracious"
"from the Lorraine region of France"
"clear ice, transparent gem"
"love, affection"
"gentle, innocent, nurturing"
"song thrush (a songbird)"
"dweller by the lane"
"cheerful, glad"
"knight, cavalry rider"
"house of the spirit of Ptah"
"to bind, captivating"
"noble, nobility"
"ardor, enthusiasm, passion"
"torch of light (from Eleanor)"
"high"
"God is my oath, God is abundance"
"birthday, born on Christmas"
"blue"
"my God is abundance"
"birthday of the Lord"
"from India; the Indus River"
Similar sound: These names share phonetic patterns with Joan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew origins, giving them the same cultural heritage as Joan.
Rhythm: Joan is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.