Fitz sits next to 3 phonetic neighbors — Fritz, Finn, and Fitz are the closest matches by sound. Most share Fitz's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of"
"man of vigor, strong man"
"Patrick's town, fighter's settlement"
"son of Paye/Pace (son of Peace)"
"made of gold, radiant"
"defender of men"
"knowing God"
"swift warrior"
"curly-haired"
"beacon hill"
"pledge, oath"
"descendant of the shouter (herald)"
"nautical term for reducing sail area"
"Great, magnificent, venerable"
"huntsman, game warden"
"descendant of the hound of valor"
"vision, ghost"
"wave"
"a crow-like black bird"
"Wise one, a sage person"
Similar sound: These names share phonetic patterns with Fitz — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Norman French origins, giving them the same cultural heritage as Fitz.
Rhythm: Fitz is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.