Keegan sits next to 5 phonetic neighbors — Reagan, Teagan, and Logan are the closest matches by sound. Most share Keegan's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of Egan, little fire"
"meadow land"
"thorny shrub, prickly plant"
"of the forest, wood-dweller"
"mill worker, grain grinder"
"Frenchman"
"modern elaboration of Jason"
"son of"
"healer (if derived from Jason/Kason)"
"dweller near the woods"
"spear rule"
"people's victory"
"estate of the fifth son"
"man of laurels, from Laurentum"
"soldier"
"to follow a course, leave a mark"
"free man"
"alert, watchful, vigilant"
"ancient, enduring"
"son of Karr"
Similar sound: These names share phonetic patterns with Keegan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Irish Gaelic (Mac Aodhagáin) origins, giving them the same cultural heritage as Keegan.
Rhythm: Keegan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.