Savannah Marshall, the current undefeated WBO middleweight champion, has been dubbed "the hardest-punching female fighter in the world" by Sky Sports. She has an impressive record of 12 wins, 0 losses, and 10 knockouts, with her most recent victory coming by knockout.
Ann Wolfe, who is widely considered one of the greatest female boxers of all time, is another name that frequently appears in search results as one of the hardest-hitting female boxers in the sport's history. She retired from boxing in 2006 with a record of 24 wins, 1 loss, and 16 knockouts.
Finally, in a more general search of the hardest-hitting boxers, some articles mention names like Christy Martin, Laila Ali, and Claressa Shields as boxers who also possessed significant knockout power.
In summary, while there are several female boxers known for their hard-hitting abilities, the names that appear most frequently among the boxing community are Savannah Marshall and Ann Wolfe.