Stellar sits next to 3 phonetic neighbors — Stella, Estella, and Stellar are the closest matches by sound. Most share Stellar's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"of the stars, star-like"
"little Dorrit (literary nickname)"
"Bright fame; from Germanic elements hrod (fame) and possibly relate..."
"will, desire + helmet, protection"
"nourishing, kind"
"pure"
"sixth"
"related to Brahma, the creator"
"from the island of Thera"
"all true, entirely faithful"
"kola nut, sacred plant"
"breath, the living one"
"short form of Valerie or Valentina"
"of the sorrows (religious title)"
"from Crete, the island"
"bright, shining"
"noble friend"
Similar sound: These names share phonetic patterns with Stellar — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Stellar.
Rhythm: Stellar is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.