Fredrick sits next to 4 phonetic neighbors — Frederick, Fredrik, and Fritz are the closest matches by sound. Most share Fredrick's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"peaceful ruler"
"from the coal settlement"
"protector of mankind"
"divine, of the god of wine"
"set apart, destined"
"modern spelling of Coe (jackdaw bird)"
"supreme ruler"
"of noble origin"
"modern invented name, possibly dark one"
"that which is true or real"
"east settlement, eastern village"
"son of Evar; son of the boar"
"of the wood, forest-born"
"red-haired, little redhead"
"from the town, settlement"
"warrior, battle"
"God has given"
"middle of the plain (city name)"
"place of lime trees"
"God will heal"
"brave as a wild boar"
Similar sound: These names share phonetic patterns with Fredrick — 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 Fredrick.
Rhythm: Fredrick is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.