Ritchie sits next to 4 phonetic neighbors — Richie, Ricki, and Roxy are the closest matches by sound. Most share Ritchie's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"powerful ruler"
"modern coinage with melodic -nell suffix"
"Possibly invented American name; associated with leadership"
"from Berlin; little shining one"
"elf counsel, wise counsel"
"rival, striving to excel"
"twin"
"flowering, in bloom"
"Blind; sixth; associated with Saint Cecilia, patron saint of musicians"
"forest dweller"
"Olive tree; peace; a variant of Olivia"
"bold as a bear"
"grove of poplar trees, tree-lined avenue"
"lily flower, night"
"oath"
Similar sound: These names share phonetic patterns with Ritchie — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old High German ric + hard origins, giving them the same cultural heritage as Ritchie.
Rhythm: Ritchie is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.