I pronounce
Frederick as FRED-ə-rik, and
Fredrick as FRED-rik, and I much prefer the initial spelling. I adore
Freddie, it's jaunty and energetic, as well as being associated with
Freddie Mercury.
masculine list:
https://www.behindthename.com/pnl/191050/124079feminine list:
https://www.behindthename.com/pnl/191050/124080