Andersen sits next to 4 phonetic neighbors — Anderson, Anders, and Andrew 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; son of the manly one"
"warrior's town"
"modern invention, noble and bold"
"one who has achieved his goal (from Siddharth)"
"eternal ruler"
"from Athens"
"supplanter, he who follows at the heel (as Jacob)"
"tailor, cloth cutter"
"greatest's son"
"anointed one"
"traveling salesman"
"little dove"
"twin"
"spear strength"
"warrior"
"he will laugh, laughter, one who laughs"
"swift flier, visionary (symbolic meaning)"
"excellent, fine"
"dark settlement"
"friend of horses"
"helped by God, God has supported"
Similar sound: These names share phonetic patterns with Andersen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Norse 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.