This is one of those cases where there are two hostas with the same name. Neither are currently registered with The American Hosta Society. The first one to be registered would become the "official" hosta of that name and the others would have to be renamed.

The leaves of this small size cultivar are green with creamy yellow streaked variegation. Its leaves have very wide, flat petioles and come to a point. 'Bolero' is a non-registered hosta of unidentified parentage from Alex Malloy of New York.

A cultivar by this name was listed on the Hosta Library. 

Hosta Helper will call this plant 'Bolero' (Malloy)

Name of a Spanish dance or a jacket with short sleaves.

Originated by Ken Ziarek of Wisconsin, this non-registered cultivar is of unidentified parentage. It is an upright growing, large size hosta with dark blue-green, broadly ovate foliage.

A cultivar by this name was listed on the Hosta Library. 
Hosta Helper will call this plant 'Bolero' (Ziarek)