Zephyr sits next to 3 phonetic neighbors — Zara, Zelda, and Heather are the closest matches by sound. Most share Zephyr's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"west wind, gentle breeze"
"brave, manly"
"beloved lake"
"of the heart (Yasin)"
"petite, feminine form of Charles"
"stag's woodland, forest clearing"
"she who lives"
"hazel tree meadow"
"dark red, crimson"
"joyful, exuberant"
"oak tree, terebinth"
"deep purplish-red color"
"lyric, of or relating to the lyre, suitable for singing"
"fairy lake"
"sea, ocean"
"beautiful (Yiddish/Hebrew)"
"pearl"
"a place above in the mountains"
"dear little one"
"of the Gauts tribe"
"wished-for child, beloved"
Similar sound: These names share phonetic patterns with Zephyr — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Zephyr.
Rhythm: Zephyr is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.