Jan sits next to 4 phonetic neighbors — John, Jon, and Yan are the closest matches by sound. Most share Jan's Dutch-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"God is gracious"
"of the forest, wooded"
"mild, merciful"
"yew bow warrior; archer"
"gift of God"
"victory"
"powerful ruler of the household"
"forefather"
"proclaimer of peace"
"wanderer"
"God has given"
"eagle friend"
"horn, strong-willed"
"God is salvation"
"given by Yahweh"
"crowned with laurel"
"Isle of Skye, Scotland"
"defender of men (short for Alexander)"
Similar sound: These names share phonetic patterns with Jan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew (via Latin Johannes) origins, giving them the same cultural heritage as Jan.
Rhythm: Jan is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.