Katara sits next to 4 phonetic neighbors — Tamara, Sahara, and Kiara are the closest matches by sound. Most share Katara's Arabic (possible inspiration)-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"flowing water, to drip or trickle"
"beautiful, pretty"
"one who carries"
"close to God, beloved"
"God is my father"
"whole, universal"
"supplanter, one who follows"
"healer, physician"
"harmony, fair one"
"inspired by Germany (spear-land, warrior country)"
"rose or lily flower"
"soft breeze, gentle wind"
"angels, of the angels, divine messengers"
"the name of Sequoyah, creator of the Cherokee syllabary"
"universal + renowned warrior (compound)"
"radiant counsel (via Germanic Ray + Lin)"
"unborn, eternal soul"
"winding valley, crooked hill"
"graceful flower"
"bright fame"
"pipe player, flute player"
Similar sound: These names share phonetic patterns with Katara — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Arabic (possible inspiration) origins, giving them the same cultural heritage as Katara.
Rhythm: Katara is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.