Sagan sits next to 5 phonetic neighbors — Logan, Reagan, and Caigan are the closest matches by sound. Most share Sagan's Polish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from Żagań (city in Poland)"
"quietness, contentment"
"God is my strength"
"from the ash tree valley"
"king's portion"
"horn blower"
"queen, counsel"
"descendant of the peaceful one"
"son of one with a bright mind"
"strong, powerful"
"strong, powerful"
"God has healed"
"south; fortunate, auspicious"
"Yahweh remembers"
"from the east, eastern settlement"
"promised by God"
"the great beast, tiger"
"spirited, broad"
"phonetic variant of Slade"
"salvation of the Lord"
Similar sound: These names share phonetic patterns with Sagan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Polish/Silesian origins, giving them the same cultural heritage as Sagan.
Rhythm: Sagan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.