Jennylyn sits next to 4 phonetic neighbors — Jennifer, Jennalyn, and Carolyn are the closest matches by sound. Most share Jennylyn's Hebrew and Welsh compound-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"God is gracious, beautiful lake"
"Son of Aodh (fire god)"
"blissful valley"
"life, alive"
"Night; dark beauty"
"people of the forest"
"the Lord is my God; Yahweh is my God"
Similar sound: These names share phonetic patterns with Jennylyn — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew and Welsh compound origins, giving them the same cultural heritage as Jennylyn.
Rhythm: Jennylyn is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.