Modern American blend, likely meaning unique or solitary
Shamonica is a modern American invented name. It likely combines the popular prefix 'Sha-' with the name Monica, which is derived from the Latin 'monere' (to advise) or the Greek 'monos' (alone).
Less common today
Shamonica isn't in the latest US Top 1000. It last peaked at #5,202 in 1992.
US births per 5-year period, 1990βpresent (SSA data).