Johanna sits next to 4 phonetic neighbors — Joanna, Hannah, and Savanna are the closest matches by sound. Most share Johanna's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"God is gracious"
"to warn, admonish"
"pure, clean"
"child of light"
"the Lord is God"
"one who hunts"
"rock, cliff"
"who is like God?"
"world-encircling river"
"from India, the Indus River"
"settlement on the ledge"
"seaweed (edible)"
"joy, happiness, gladness"
"peace (related to Ériu)"
"from the green valley"
"noble ruler"
"hardworking, industrious"
"short for Indiana or India"
"high meadow"
Similar sound: These names share phonetic patterns with Johanna — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew origins, giving them the same cultural heritage as Johanna.
Rhythm: Johanna is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.