Calahan sits next to 4 phonetic neighbors — Callahan, Callum, and Callan are the closest matches by sound. Most share Calahan's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
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Similar sound: These names share phonetic patterns with Calahan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Irish ceallach origins, giving them the same cultural heritage as Calahan.
Rhythm: Calahan is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.