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"
"full of life"
"diminutive of Harriet (home ruler)"
"faithful wife (mythological)"
"descendant of Leannán"
"day's eye"
"flag, banner"
"sea of bitterness, wished-for child"
"lily flower, purity"
"lady, queen"
"beautiful one, noble"
"powerful laborer, work ruler"
"king's wood; royal clearing"
"youth-producing, ever-young"
"noble, of noble kind"
"ruler of elves, elf counsel"
"breath, to breathe"
"strong, virtuous, honorable"
"grace, favor of God"
"queen"
"strength, valor"
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.