Cordero sits next to 4 phonetic neighbors — Cordell, Cordero, and Cord are the closest matches by sound. Most share Cordero's Spanish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"lamb"
"steadfast, strong"
"descendant of Donndubhan"
"meadow land, fallow land"
"descendant of Raghallach"
"modern coinage, possibly 'thankful lion'"
"long hill, ridge settlement"
"little seal"
"Fortune, riches"
"resin, tree sap (unrelated etymology)"
"variant of risen (past tense of rise)"
"deer; graceful one (indigenous interpretation)"
"one who lays tiles"
"priest's estate"
"of legend, mythic, extraordinary"
"fruitful, productive"
"quality, excellence of character"
"handsome, beloved"
"of the forest, from the wood"
"gift of healing"
"large homestead, big village"
Similar sound: These names share phonetic patterns with Cordero — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Spanish origins, giving them the same cultural heritage as Cordero.
Rhythm: Cordero is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.