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"
"sixth"
"noble, exalted"
"lily flower"
"from Crete, the island"
"kola nut, sacred plant"
"bright, shining"
"Bright fame; from Germanic elements hrod (fame) and possibly relate..."
"related to Brahma, the creator"
"joyful, merry, carefree"
"from the island of Thera"
"breath, the living one"
"resolute protector"
"short form of Valerie or Valentina"
"sorrows, pains"
"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.