X - David J. Peterson

Xail - Sampo Taito Louke

Xap II - Andrew Leventis

Xapqt - Nick Summers

Xara - Jim Taylor

xathmel - Paul Blake

Xéniara - Pokpong Wongkaeo

Xianese - John Whatmough

Xliponian - Ronald Kyrmse

Xronari - Libor Sztemon

Xt! - Adam Walker

xuxuxi - John Cowan