Most of those are animals or monsters, who don't count. The only real PEOPLE he killed are Red Ribbon Army Soldiers, Black, Murasaki and probably captain yellow. And I guess Piccolo and his children but really I'm not sure if Piccolo counts.
Namekians reproduce by spitting out eggs, but Piccolo Jr. goes out fo his way to mention he's a reincarnation. And indeed, HAD Goku killed Piccoli, Kami would've died. So is Piccolo truly dead?