Deneen sits next to 4 phonetic neighbors — Denine, Janine, and Nadine are the closest matches by sound. Most share Deneen's Old English/American-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from the valley"
"home ruler, industrious"
"butcher, one who slaughters"
"exquisitely beautiful, charming"
"One who operates a press; press forward with urgency"
"prosperity, fair weather, rich ore vein"
"God is gracious; Yahweh is gracious"
Similar sound: These names share phonetic patterns with Deneen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English/American origins, giving them the same cultural heritage as Deneen.
Rhythm: Deneen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.