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"
"ewe, female sheep"
"hardworking, industrious"
"type of red or pink flowering plant"
"told by God, God has heard"
"son of Adam"
"brave, strong"
"mine, beloved"
"grace (diminutive of Anna)"
"soft-haired, youthful"
"to bind, ensnare"
"live coal, smoldering fire"
"wild boar meadow"
"eighth"
"from the town of Paisley, meaning church or basilica"
"blooming flower, radiance"
"lioness of God"
"maiden"
"white hero"
"poppy flower"
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.