Different names for Black Seed
Nigella Sativa is the botanical name but the same thing is known by various names in different regions and cultures. Black seed perhaps being the most common, but other names are black cumin seen, black caraway, habbah sawdaa (الحبة السوداء), habbatul barakah (الحبة البركة), Kalonji (كلونجي) and khalizira.
If you know any more names, give us a shout.
The name onion seeds is often incorrectly used to refer to black seed but is actually something else.