Son or little son
Originally a diminutive of the English word 'son', it was often used as a nickname for a male child or a junior family member. While historically masculine, it has evolved into a rare unisex choice, sometimes used as a short form of names like Sonia or Sonny.
Less common today
Sonnie isn't in the latest US Top 1000. It last peaked at #4,562 in 1992.
Gospel singer and songwriter
Professional rock climber
US births per 5-year period, 1990βpresent (SSA data).