Geisha sits next to 4 phonetic neighbors — Aisha, Keisha, and Leisha are the closest matches by sound. Most share Geisha's Japanese cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"person of art, artist (professional title)"
"singer, singing one (by association)"
"inventive/blended origin with Japanese sounds"
"sea, ocean"
"sunlight, brightness"
"of or relating to Katori, a sacred place in Japan"
Similar sound: These names share phonetic patterns with Geisha — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Japanese origins, giving them the same cultural heritage as Geisha.
Rhythm: Geisha is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.