This is from the City of Yelm's website:
According to Nisqually legend, the area was first known as Shelm, the name
given to the shimmering heat waves which dance and play above the prairie
when the summer sun shines hot. A great prairie creates a great haze. This
was emphasized by the Nisqually by drawing out the syllable to say
"S-S-S-SHELM". The impatient Euro-American settlers eventually shortened
this to Yelm
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