I'm not sure if all these give "no clue", but they are somewhat obscure clues:

The Law of the Unconscious Statistician.

The Chinese Postman Problem

The Googol Game (aka the Secretary Problem)

The Butterfly Lemma and The Snake Lemma

I'm not sure if all these give "no clue", but they are somewhat obscure clues:

The Law of the Unconscious Statistician.

The Chinese Postman Problem

The Googol Game (aka the Secretary Problem)

The Butterfly Lemma and The Snake Lemma

The Art Gallery Theorem (or Problem)

and for those who know some Latin:

Theorema Egregium and Pons Asinorum