in English is:

xylophonist

Mutations

Soft:(no mutation)
Nasal:(no mutation)
Aspirate:(no mutation)

Use

y seiloffonydd hwn
fy seiloffonydd i
dy seiloffonydd di
ei seiloffonydd ef/o
ei seiloffonydd hi
ein seiloffonydd ni
eich seiloffonydd chi
eu seiloffonydd nhw/hwy
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