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"
"shining torch"
"gift of God"
"elf ruler, ruler of supernatural beings"
"Indian dye"
"falling tone, resolution"
"bright, cheerful"
"gift from God"
"rain, precipitation"
"weapon, mace"
"joyful"
"glory, fame"
"short for Indiana or India"
"spiritually renewed"
"star that suddenly brightens"
"one's own meadow, Aen's clearing"
"famous warrior"
"little bird"
"captivating, snare"
"laurel tree; bay laurel"
"safe, unharmed"
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.