Jettsen sits next to 4 phonetic neighbors — Jensen, Jenson, and Preston are the closest matches by sound. Most share Jettsen's Scandinavian cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of Jens (son of John)"
"energy, spirit, vigor"
"bear strength"
"home ruler"
"wide meadow, wide island"
"anointed one"
"strong, powerful"
"he will laugh, laughter, one who laughs"
"joyful celebration, festivity"
"battle warrior, army in battle"
"wisdom, scientific wonder (modern cultural meaning)"
"beloved (possibly influenced by love)"
"three, third"
"warrior's town"
"who is like God?"
"bright, shining, moon-like"
"warrior"
"craftsman"
"possibly related to Old Norse Olaf (ancestor's relic)"
"modern American name, phonetic creation"
"peaceful, tranquil"
Similar sound: These names share phonetic patterns with Jettsen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Scandinavian patronymic origins, giving them the same cultural heritage as Jettsen.
Rhythm: Jettsen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.