Iceland sits next to 3 phonetic neighbors — Ireland, Islandia, and Aisling are the closest matches by sound. Most share Iceland's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"land of ice, icy land"
"grace, charm"
"twin"
"helmeted chief"
"the Milky Way, vast star system"
"slender, fair"
"heavenly, of the sky"
"sky, heavens, cloud"
"who is like God"
"noble spear"
"land of the Norsemen"
"whitish, fair"
"royalty, noble one from the heavens"
"cleft, divided by force"
"way, road, path"
"bright, radiant"
"daughter"
"row of houses or hedgerow"
"beloved, darling"
"moon, moon goddess"
"Lord have mercy (prayer refrain)"
Similar sound: These names share phonetic patterns with Iceland — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Norse origins, giving them the same cultural heritage as Iceland.
Rhythm: Iceland is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.