Ian sits next to 3 phonetic neighbors — Evan, Ewan, and Ryan are the closest matches by sound. Most share Ian's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"God is gracious"
"my God is Yahweh"
"father of many nations"
"rider, equestrian"
"strong as a lion"
"brave in war"
"merciful, gentle"
"the river Jordan"
"strong-willed warrior"
"man from Lucania"
"elf counsel, supernatural wisdom"
"one who resembles God"
"cask maker, craftsman"
"gift of God; Yahweh has given"
"battle"
"whole-hearted, faithful"
"one who walks"
"great king"
"venerable, sacred"
"strong, powerful"
Similar sound: These names share phonetic patterns with Ian — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Scottish Gaelic origins, giving them the same cultural heritage as Ian.
Rhythm: Ian is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.