Josh sits next to 3 phonetic neighbors — Joss, Joel, and Ross are the closest matches by sound. Most share Josh's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"God is salvation"
"tempest, violent storm"
"fortified place, protection"
"helpful person"
"son of the earth-man"
"boar-friend, warrior companion"
"from Galloway"
"scholar"
"warrior, battle"
"rhythm, flow, cadence"
"enlightenment, awakening"
"little fire (from Irish aodh)"
"small gift of God"
"ruler of peace"
"deep blue color"
"son of Maurice"
"son of the fiery one"
"of the forest, woodland"
"supplanter, one who replaces another"
"descendant of the salmon"
"fair-haired one"
Similar sound: These names share phonetic patterns with Josh — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew origins, giving them the same cultural heritage as Josh.
Rhythm: Josh is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.