Deisi is of Basque origin, derived from the ancient Basque name 'Teodosi'. It means 'gift of God'. The name was popular among the Basque nobility during the Middle Ages and has since been adopted by other cultures as well.
The name Deisi experienced a significant rise and fall in popularity over the years, with peaks in 1983 (26 births), 1995 (28 births), and 1999 (31 births). However, it appears that this name's popularity has been declining since its peak in the late 1990s, with only 5 births recorded in 2018. Overall, there were a total of 574 babies named Deisi between 1983 and 2018.