Sadie sits next to 4 phonetic neighbors — Lady, Brady, and Grady are the closest matches by sound. Most share Sadie's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"princess, noblewoman"
"red king"
"noble, nobility"
"slope, hillside"
"hare's meadow, hare clearing"
"bright fame"
"called forth, gloriously summoned"
"gentle, mild-mannered"
"gift"
"worthy of love"
"green, blooming"
"sun, moon"
"servant of St. Fillan"
"wealth, fortune, prosperity"
"resolute protector, will-helmet"
"flat piece, thin layer"
Similar sound: These names share phonetic patterns with Sadie — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew (Sarah) origins, giving them the same cultural heritage as Sadie.
Rhythm: Sadie is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.