Holdon is of English origin, derived from an Old Norse personal name Holda, which means 'to hold'. It has been used sparingly throughout history but is not considered extremely common.
"Holdon appears to have been a popular name for babies born between 1994 and 2019, with peaks in usage around the years 1994, 2000, 2009, 2010, and 2017. The most recent data shows that this name was given to eight newborns in 2019."