— y Kedyrn, 280, 282, 283, 386.

— Prydein, 281, 282.

— Wair, [679].

Yr Ystrad, 39–46.

ysbryd y lantar, 59.

Yscawt, [529].

Yskithyrwynn Pennbeiđ, [520].

Yspađaden, [520], [646], [647].

Yspytty Ifan, 206, [693].

Ystalyfera, 251, [522].