Fidelis is of Latin origin, derived from the adjective 'fidelis', which means faithful. It is composed of the root 'fides' meaning faith, trust, or loyalty, and the suffix '-lis'. Thus, Fidelis can be interpreted as 'faithful' or 'loyal'. Historically, it was used in Latin texts to describe someone who was reliable, steadfast, or devoted. In some instances, it has been used as a given name, particularly among Catholics due to its association with Saint Fidelis of Sigmaringen.
The name Fidelis experienced a significant increase in popularity during the early to mid-20th century, with an overall total of 114 babies named Fidelis born between 1904 and 1941. The years with the highest number of births were 1926 (11) and 1921 (8), indicating that these periods might have seen a surge in interest or relevance associated with the name Fidelis. However, it's essential to note that the data provided does not include birth statistics from every year within this timeframe, so there may be fluctuations not captured here.