The way The Smediums formed is almost as wishy-washy as its name.

The Amarillo rock band derives its name from drummer Seth Havens’ habit of wearing T-shirts a size too small (riding the small-medium line, though Havens, 31, insists he wears an XL — and, for that matter, that the rest of the band also wears their shirts too tight).

But the band didn’t have a name when singer Curtis McGill, who’ll turn 38 on Sunday, first came up with the idea about four years ago.