Garth sits next to 3 phonetic neighbors — Gareth, Garret, and Art are the closest matches by sound. Most share Garth's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"enclosure, yard, garden"
"poet, philosopher, wise man"
"beautiful (phonetic usage)"
"worshiper of God"
"a fast-moving projectile, symbol of speed and ambition"
"the third (in family lineage)"
"who is like God?"
"holly tree"
"stone of Obsius"
"uncertain — possibly related to the island of Ikaria"
"black banded gemstone"
"the color red"
"narrow, strait"
"short land, curtailed land"
"bright mind, shining spirit"
"Lord have mercy"
"modern invented elaboration of Kasey"
"bearer of the Aegis (goatskin shield)"
"cushion (alternative Irish etymology)"
"honoring God"
"love"
Similar sound: These names share phonetic patterns with Garth — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Norse gardr origins, giving them the same cultural heritage as Garth.
Rhythm: Garth is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.