Most people thought that the following manga (comics) are male comic artists, they are wrote under male name but actually they are female comic artists.
Hiromu Arakawa (Fullmetal Alchemist)
Ashika Sakura (Sekirei)
Daisuke Higuchi (Whistle!)
Ayako Sato (Kindaichi Case Files)
Kazuki Yamato (Godhand Teru)
Kazuya Minekura (Saiyuuki)
Takada Chigusa (Kami to Sengoku Seitokai)
Yellow Tanabe (Kekkaishi)
Mizuki Kawashita (Ichigo 100%)