Gurun’s attitude is an interesting contrast with other examples of courtly love in the
lais—unlike, say, Equitan, he thinks his beloved’s social status is a sufficient reason to break off their relationship and pursue marriage with a noblewoman instead.
La Codre means “hazelnut tree,” and
Le Fresne means “ash,” so the knights’ quip basically means that La Codre will bear good offspring for Gurun, while a relationship with Le Fresne is a dead end. The irony, as the audience knows, is that Le Fresne’s social status is the same as La Codre’s due to their noble birth.