It is the name of an animal in the sea. Seeing it in a dream signifies lofty aspiration and nobility of lineage, because it rises above others and none rises above it; and for this reason Quraysh were so named.
Dream meaning · al-Nabulsi
Shark (qirsh) قرش
Source: al-Nabulsi, Ta'tir al-Anam fi Ta'bir al-Manam, p. 282. English translation by iDreamBot. Quran verses: Quran.com, Saheeh International.