Errol sits next to 5 phonetic neighbors — Earl, Harold, and Carroll are the closest matches by sound. Most share Errol's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"earl, nobleman"
"noble valor, kingly"
"responsive song, call-and-response music"
"song, nightingale"
"sturgeon fisher, from the sturgeon settlement"
"scribe, one who reads and writes"
"lord, master"
"companion, friend (Old English origin)"
"treasurer, keeper of treasure"
"little salmon, little goad"
"fame-land, renowned in the territory"
"of noble Gascon origin"
"God has given"
"personal royalty, regal one"
"Wealthy, prosperous warrior"
"devoted to God"
"modern coined name; possibly related to Jacob (supplanter) or Jakari"
"modern American invented name"
"heart"
"healer"
Similar sound: These names share phonetic patterns with Errol — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have English origins, giving them the same cultural heritage as Errol.
Rhythm: Errol is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.