Imogen sits next to 4 phonetic neighbors — Imogene, Imogen, and Morgan are the closest matches by sound. Most share Imogen's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"maiden, girl"
"from the king's estate"
"lily flower"
"my life (ma vie)"
"agreement, concord, fitting together"
"brave as a bear"
"hawk-like (possible alternative)"
"dark, black"
"claw, fingernail (Greek)"
"related to brightness/light"
"bailiff, law enforcer"
"victory (short for Sigrid)"
"wise, knowing"
"from the city of Laurentum"
"sorrow, regret"
"maiden, daughter"
"descended from Jupiter"
"white phantom, fair spirit"
"downy-bearded, youthful"
"woman from Magdala, tower"
Similar sound: These names share phonetic patterns with Imogen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Celtic origins, giving them the same cultural heritage as Imogen.
Rhythm: Imogen is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.