Dan sits next to 4 phonetic neighbors — Don, Dean, and Jan are the closest matches by sound. Most share Dan's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"judge"
"fortified place, protection"
"modern invented American name"
"boar-friend, warrior companion"
"small gift of God"
"God is most high"
"first, beginning"
"settlement by the sea"
"old friend"
"flowing down, descend"
"son of Jen (John)"
"man, husband (archaic)"
"passionate, ardent"
"one who creates art"
"friend of the army, warrior's friend"
"church official, ecclesiastical law"
"father of peace"
"phonetic blend (possibly new house, or river)"
"defender of the people"
"air, atmosphere"
"fortified camp, military settlement"
Similar sound: These names share phonetic patterns with Dan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew origins, giving them the same cultural heritage as Dan.
Rhythm: Dan is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.