And, the Celts crossed out of Central Asiia, a lot longer ago than this.
IIRC there are some who think the Celts originated in asia. There are native populations in what are now Tibet and Nepal that have curly red hair and freckles as a known genetic trait.
Loreena McKennit is not only an excellent musician, but a pretty bright musicologist. A lot of her stuff draws on the Celtic roots in the near and mid east.
http://www.youtube.com/watch?v=4QpRCK1IbiE&feature=youtube_gdata_player