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"
"bright-headed"
"elder brother, wise child"
"from 'deaglán', possibly 'good man'"
"old friend, wise friend"
"wheel maker, cartwright"
"curly-haired"
"dark, black"
"born of the ocean wave"
"running (speed)"
"of Devon, creative modern coinage"
"he has given, gift of God"
"bearer of Christ, Christ-carrier"
"son of grace, son of good fortune"
"fragrant spice"
"land near the court"
"initials standing independently"
"angelic, messenger"
"wealthy, God's gift"
"from Sebastia"
"God is my help"
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.