Gemma sits next to 4 phonetic neighbors — Emma, Jemma, and Jenna are the closest matches by sound. Most share Gemma's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"gem, precious stone"
"weary"
"beautiful, graceful"
"lady, queen"
"sun, sunshine"
"sea of bitterness"
"beloved; of love"
"famous type"
"bright, shining light"
"magnolia flower"
"fairy maiden"
"little girl"
"favored by Yahweh"
"truth"
"grassy field, open pasture"
"worthy, powerful"
"concord, unity of parts"
"divine play"
"rowan tree (mountain ash)"
"night; dark beauty"
"wise counselor"
Similar sound: These names share phonetic patterns with Gemma — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin/Italian origins, giving them the same cultural heritage as Gemma.
Rhythm: Gemma is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.