Some sources seem to indicate that the Hmong (or Mong et-al) also were/are called Meo in Thailand. If anyone wants an easy read here’s one link but I suggest as many sources as one can find to try and find the whole picture. The Hmong probably came from south China and some research indicate that they lived there at least since the last Glacier Maximus (ice age). The people spread out to Vietnam, Laos, Burma and Thailand. Both in Thailand and in Vietnam the governments referred to the Hmong people as Meo. In China 55 smaller tribes were all grouped together and called Miao due to the language they spoke. (Miao-Yao/Hmong-Mien)
https://www.green-trails.com/ethnic-minorities-in-northern-thailand/hmong-hill-tribe/
Thats what springs to mind for me stocktont ,
ive never heard the term meo hilltribes ,
but hmong hilltribes ive seen plenty of ,
their customary clothing is hard to miss ,and there is always plenty of them around the markets in chang mai etc ...
theres a village i was taken too outside of chang mai with a few ethnic groups from across the border living , among them were the long neck people,
that area is quite diverse as far as having quite a few ethnicity s inhabiting it ..
A friend in central thailand shared some seed with me that i noted got called hmong thai ,
though i didnt know it as that , maybe the guys calling it spoke to my friend , he was online here , i dont know , but it is still doing the rounds as far as i know , which is cool ,
except that the story of where it came from has sadly disappeared .. some credit should be given to the original source i think ,, the seeds were free , and as far as i know they are now being sold , with no story of origin .. that saddens me ..