Henny sits next to 4 phonetic neighbors — Hennie, Penny, and Jenny are the closest matches by sound. Most share Henny's Scandinavian cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"home ruler"
"follower of Christ"
"strong one"
"youthful, young"
"sky, heaven"
"city of history and culture (as a name)"
"archer, bowman"
"war, combat"
"wisdom, skill"
"she who brings victory"
"free woman, strong"
"kore — young woman"
"flowing stream"
"sky meadow"
"ruler of the home"
"radiance, brilliance"
"lily flower, purity"
Similar sound: These names share phonetic patterns with Henny — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic origins, giving them the same cultural heritage as Henny.
Rhythm: Henny is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.