The specific epithet luteus seems obscure, because the Latin prefix lute- generally implies saffron yellow (the pores are yellow, but more lemon yellow than saffron); however, another meaning of luteus is dirty or muddy, and that may be the origin in this instance. If you have a reference source for this please let us know. Meanwhile the generic name Suillus is much more straightforward, coming from the Latin noun sus, meaning pig. Suillus therefore means 'of pigs' (swine) and is a reference to the greasy nature of the caps of all fungi in this genus.