Kertis is of English origin, derived from the Middle English word 'certeys', which means 'certain'. It was used as a nickname for someone who was dependable and reliable, much like the meaning behind the name. In the past, it was more common in England but has since become quite rare.
The name Kertis had a quiet debut with just 5 births recorded in 1989, followed by a slight increase to 6 births two years later in 1991. Altogether, there were 11 babies named Kertis during this period.