All My Love- Led Zeppelin

[gldstwmn]

The song was about his son that passed away. I do believe he was using the word "Aryan" which despite it's present associations, had nothing to do with Hitler.
From Wikipedia:
Aryan is an English word derived from the Sanskrit "Ārya" meaning "noble" or "honorable". The Avestan cognate of the Sanskrit term is "Airya" and the Old Persian equivalent is "Ariya." It is widely held to have been used as an ethnic self-designation of the Proto-Indo-Iranians. Since, in the 19th century, the Indo-Iranians were the most ancient known speakers of Indo-European languages, the word Aryan was adopted to refer not only to the Indo-Iranian people, but also to Indo-European speakers as a whole.

In Europe, the concept of an Aryan race became influential in the late 19th and early 20th centuries as linguists and ethnologists argued that speakers of these Indo-European languages constitute a distinctive race, descended from an ancient people, who were referred to as the "primitive Aryans", but are now known as Proto-Indo-Europeans.

In linguistics, Aryan is most often used in the context of the sub-branch of Indo-Iranian languages referred to as Indo-Aryan languages.