Brecon Beacons National Park

Afon Aman                                                 

'Aman' is either a personal name or comes from 'amanw' meaning pig/let.  The river gives its name to Ammanford/Rhydaman, Glanaman and to Brynaman

Afon Bran

'bran' is crow and may be a reference to the colour of the water - peaty or perhaps shaded?

Afon Cennen

'cennen' is leek or lichen or possibly a personal name 'Cennen'

Afon Clydach

'clydach' means sheltered, strong, swift or stony

Afon Crai

'crai' may mean rough or severe.  The river gives its name to the village too.

Afon Cynrig

meaning not known

Afon Gwydderig

meaning not known

Afon Hepste

'dry river' perhaps?

Afon Hydfer

'bold stream'

Afon Llia

meaning not known

Afon Mellte

lightning river - perhaps due to its rising & falling quickly.  Gives its name to the village of Ystradfellte.

Afon Nedd Fechan

little Neath river.  The meaning of 'nedd' is not known but is similar to the R. Nidd in N. Yorkshire

Afon Pyrddin

'pyrddin' is the 'pure man' - an allusion to St David

Afon Sawdde

meaning not known

Afon Senni

'Senni' is either a personal name or means 'insulting' - referring perhaps to the sound of its flow?

Afon Tarell

meaning not known

Afon Taf

Afon Tawe / River Tawe

'taf' is an old name with similar origins to the name 'tawe'

'tawe' is an old name possibly signifying still and deep flowing. 

Afon Twrch

'boar river' - from supposed 'snouting' action of its waters or perhaps 'burrowing' through the land?

Afon Tywi / River Towy

'tywi' probably signifies still and deep flowing

Sychryd

Taf Fawr

Taf Fechan