In 1970 , South Yemen changed its name to the People 's Democratic Republic of Yemen thus eliminating any directional reference in either of the Yemens ' official names .
The existence of two Yemens preserved the North Yemen and People 's Democratic Republic of Yemen   designations in popular parlance .
In 1970 , South Yemen changed its name to the People 's Democratic Republic of Yemen thus eliminating any directional reference in either of the Yemens ' official names but the existence of two Yemens preserved the North Yemen and South Yemen designations in popular parlance .