Fabian sits next to 4 phonetic neighbors — Damian, Sebastian, and Adrian are the closest matches by sound. Most share Fabian's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"of the bean growers (Fabii clan)"
"mighty power, ruler"
"Roman pilgrim"
"of the Sergii clan"
"from Laurentum, laurel-crowned"
"son of Jens (son of John)"
"little fawn"
"gracious, dear"
"wanderer, Gaelic speaker"
"steadfast defender"
"rising in the sky, boundary"
"descendant of Ceallachán"
"free man, freeholder of land"
"I believe (credo)"
"mortal, earthly"
"the jay bird, blue jay"
"Yahweh has been gracious"
"dweller near the ridge"
"from the brushwood thicket"
"of Mars, consecrated to the god of war"
"king"
Similar sound: These names share phonetic patterns with Fabian — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin (faba = bean) origins, giving them the same cultural heritage as Fabian.
Rhythm: Fabian is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.