Eyder sits next to 3 phonetic neighbors — Aider, Rider, and Cyder are the closest matches by sound. Most share Eyder's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"island of the river"
"bold people, brave among the people"
"gift of God"
"Nile River"
"firebrand, burning sword"
"the end, conclusion of a journey"
"famous ruler"
"of the Fabian clan"
"God supports, Yahweh supports"
"power of the people"
"who is like God?"
"dark-haired one"
"beloved of God"
"noble eagle"
"God is gracious"
"strength of God"
"full-grown man"
"one of the Franks (a Germanic tribe)"
"belonging to Mars"
"river of the wolf, valley river"
"victory of the people"
Similar sound: These names share phonetic patterns with Eyder — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic origins, giving them the same cultural heritage as Eyder.
Rhythm: Eyder is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.