The name "Fredericksen" can be spelled in a few different ways due to varying regional accents and dialects. However, in standard American English, the correct spelling is /ˈfrɛdərɪksən/. The first syllable "Fre" is pronounced like "fred" with a short "e" sound, followed by the second syllable "der" with a schwa sound. The final syllable "icksen" rhymes with "mixen" and ends with a strong "en" sound. It is important to use the correct spelling in official and legal documents to avoid confusion.
There is no widely recognized word "fredericksen" in English. It appears to be a proper noun, possibly derived from a name.