Stephan sits next to 4 phonetic neighbors — Stefan, Steven, and Stephen are the closest matches by sound. Most share Stephan's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"crown, wreath"
"supplanter, one who replaces another"
"brave spear, strong with a spear"
"pointed mountain, hill"
"father of peace"
"son of Kenneth / son of Coinneach"
"one who shines, illuminates"
"to close, knot"
"old town, settlement"
"pale, holy"
"beauty, ornament"
"payment, redemption (word association)"
"elf ruler"
"invented blend of Jared and Gareth"
"otherwise known as, alternate name"
"modern creative name construction"
"one who illuminates, enlightener"
"pierce the valley"
"fiery, ardent"
"heart, spirit"
"nonconformist, free spirit"
Similar sound: These names share phonetic patterns with Stephan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Stephan.
Rhythm: Stephan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.