This is the 1073rd most frequent Turkish word.
soylu
"Noble" or "aristocratic."
Here, 'soylu' is used as an adjective meaning 'noble' to describe the family background.
Soylu bir aileden geldiklerini söylüyorlar.
They say that they come from a noble family.
In this sentence, 'soylu' refers to behaving in a way that is admirable or honorable, extending its adjective usage to moral character.
Her zaman soylu bir davranış sergilemelisin.
You should always exhibit noble behavior.
Here, 'soylu' is used to modify 'ideas,' implying that the ideas are of a high moral or ethical quality.