Birch is of Norse origin, derived from the Old Norse 'bjǫrk', which means 'birch tree'. This name gained popularity during the Viking Age and was often given to children born under the sign of the Birch, a sacred tree in Norse mythology. It is pronounced /bɜːrtʃ/ and has been used in various forms throughout history, including as a surname.
"The name Birch has seen a significant increase in popularity since the late 20th century, with a marked spike starting from the year 2016 onwards."