Andersen sits next to 4 phonetic neighbors — Anderson, Andersan, and Andrea are the closest matches by sound. Most share Andersen's Scandinavian cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of Anders (man, warrior)"
"noble power"
"flower, blooming"
"handsome, well-built"
"bird-like"
"to bewilder, to daze"
"lake, waterfall, pool"
"messenger of God, angel"
"beautiful, gracious"
"tenderly beloved, darling"
"from the Lennox district of Scotland"
"new, newly discovered"
"fair, bright (fionn) + warrior/hero (lagh)"
"modern African-American creation"
"from Rome, Roman woman"
"feminine form of Jason/Jaylen (healer, supplanter)"
"God beholds, He sees"
"broad meadow (constructed meaning)"
"God has enriched/blessed me"
"variant of Cira or Cyra"
Similar sound: These names share phonetic patterns with Andersen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Danish/Norwegian origins, giving them the same cultural heritage as Andersen.
Rhythm: Andersen is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.