Not for me, Michael. You may own to 'celtic music' and get used to it if you wish, but I for one will not have a bar of it.
Anyone telling me I perform 'celtic' music is politely advised otherwise and left in no doubt as to my views on the matter.
The term is, as Anahata says, a marketing invention to make a commercial killing out of wildly promoted, upbeat 'irish' music. Then it was collectively applied to all manner of Irish, Scottish, Breton etc., music
Time and a newer craze will perhaps relegate the expression to history.