clothing manufacturer trendy in the 1970s and 1980s, the company name was bought in 1930s from A.J. Izod, a London tailoring establishment. The surname (also Izzard, etc.) goes back to the Middle Ages and might be related to the proper name Isold.
fem. proper name, French Isolt, Iseut, of Germanic origin, literally "ice-rule," from Proto-Germanic *is "ice" (see ice (n.)) + *waldan "to rule" (from PIE root *wal- "to be strong").