Adam sits next to 4 phonetic neighbors — Ada, Adame, and Adama are the closest matches by sound. Most share Adam's Hebrew-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"earth, ground"
"gift of Yahweh"
"flower"
"dear one"
"flower; blooming"
"pure, clean"
"queen (from Regina)"
"star of the sea, beloved"
"creative American name coinage"
"wading, crossing water"
"rosy-cheeked, bright"
"flock, herd"
"mountain peak"
"settlement on a cliff"
Similar sound: These names share phonetic patterns with Adam — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew origins, giving them the same cultural heritage as Adam.
Rhythm: Adam is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.