Frederik sits next to 4 phonetic neighbors — Frederick, Friedrich, and Federico are the closest matches by sound. Most share Frederik's Dutch-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"peaceful ruler"
"venerable, revered"
"dear friend, beloved companion"
"the greatest, most excellent"
"holy heir"
"archer"
"great, venerable, magnificent"
"peaceful will"
"anointed one who carries"
"desert world (fictional)"
"bold, brave counsel"
"who is blessed"
"experienced in rule"
"treasurer, keeper of treasure"
"Caesar, leader"
"hill, ridge, small summit"
"peace + power"
"saddlemaker, one from the homestead"
"strong man"
"God is gracious"
Similar sound: These names share phonetic patterns with Frederik — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic origins, giving them the same cultural heritage as Frederik.
Rhythm: Frederik is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.