Refers to a name that was previously used but has since been changed, such as for a company, organization, place, or product.
The company's former name was Yamada Trading.
It is sometimes called by its old name.
Also means 'former name,' but 旧名 is often used for people or historical names, whereas 旧名称 is more common for organizations and things.
Compound of 旧 (former, old) + 名称 (name, designation).