Sunday sits next to 4 phonetic neighbors — Sunny, Sandy, and Sonata are the closest matches by sound. Most share Sunday's Old English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"day of rest and worship"
"modern invented name with -ley suffix"
"God has answered"
"bitter sea, wished-for child"
"queen"
"my God is abundance"
"climbing vine"
"jaybird; modern melodic invention"
"little dark one, dark-complexioned"
"land power"
"wished-for child"
"downy-bearded, youthful"
"falling tone, resolution"
"one who hunts"
"one who weakens or brings low"
"goodness, beneficence"
"strength in battle"
"reborn, born again"
"freedom, the condition of being free"
"from the raven meadow (possible)"
"girl, youth"
Similar sound: These names share phonetic patterns with Sunday — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English origins, giving them the same cultural heritage as Sunday.
Rhythm: Sunday is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.