Karthik sits next to 4 phonetic neighbors — Kartik, Karthick, and Kartic are the closest matches by sound. Most share Karthik's Indian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"born in the month of Kartik"
"always new, ever-fresh"
"breath mantra, self-realization"
"auspicious, blessed"
"divine, belonging to Shiva"
"portion of the divine"
"without noise, quiet"
"son of Kartikey, the god of war"
"sage, seer, enlightened one"
"evening, dusk"
"auspicious; gracious; kind"
"health, vigor, life-force"
"rule, discipline, restraint"
"community, society"
"forward movement, purposeful progression"
"auspicious, blessed"
"unique, unparalleled, one of a kind"
Similar sound: These names share phonetic patterns with Karthik — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Sanskrit origins, giving them the same cultural heritage as Karthik.
Rhythm: Karthik is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.