Courtney sits next to 4 phonetic neighbors — Cortney, Kortney, and Brittney are the closest matches by sound. Most share Courtney's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from the domain of Curtius"
"female traveler, voyager"
"night, dark beauty"
"land of Amerigo Vespucci"
"noble, gracious"
"princess, noble"
"victorious, joyful (from Jai)"
"clarity, clearness"
"little Goth, from the Germanic tribe"
"pearl"
"queen (short form of Regina)"
"beautiful, pretty"
"new star"
"the state of being divine or sacred"
"star of the sea; beloved"
"royal, majestic"
"place by the sea (Moorish origin)"
"generous love, benevolence"
"famous warrior"
"fire, sacred flame"
"sequence of musical notes"
Similar sound: These names share phonetic patterns with Courtney — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Norman French origins, giving them the same cultural heritage as Courtney.
Rhythm: Courtney is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.