Resolute protector
Wm is the standard historical abbreviation for the name William. It derives from the Germanic elements 'wil', meaning desire or will, and 'helm', meaning helmet or protection.
Less common today
Wm isn't in the latest US Top 1000. It last peaked at #4,997 in 1990.
US births per 5-year period, 1990βpresent (SSA data).
Founder of the Wm. Wrigley Jr. Company
Author of the best-selling novel The Shack