Fredrik sits next to 5 phonetic neighbors — Frederick, Friedrich, and Fritz are the closest matches by sound. Most share Fredrik's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"peaceful ruler"
"high kin, chosen son"
"son of Mads (Matthew)"
"home ruler, ruler of the estate"
"chance, good fortune"
"people's ruler"
"enclosed field"
"Germanic family name of uncertain origin"
"gift of God"
"son of the brave, warrior"
"whole, universal"
"bold advisor"
"eternal ruler, ever powerful"
"elevated terrain, mountain land"
Similar sound: These names share phonetic patterns with Fredrik — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old High German origins, giving them the same cultural heritage as Fredrik.
Rhythm: Fredrik is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.