Janson sits next to 4 phonetic neighbors — Jason, Hansen, and Jansen are the closest matches by sound. Most share Janson's Scandinavian cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of Jan"
"small place of worship"
"slender, narrow one"
"steep meadow or woodland clearing"
"God (Jah) with diminutive -ki suffix"
"the brightest star"
"male infant, term of endearment"
"God is witness"
"elf friend, magical friend"
"belief, faith, creed"
"hunter's woodland"
"modern coinage combining Jay (God) and -ren suffix"
"standalone initials name"
"one who resembles God"
"defender at the weir or fortress"
"from Devon, poet"
"Angel of Death"
"gift of God"
"father of peace"
"twin"
"pause, reflection, musical interlude"
Similar sound: These names share phonetic patterns with Janson — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Scandinavian/Dutch origins, giving them the same cultural heritage as Janson.
Rhythm: Janson is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.