Rashi on Numbers 13:33/רש"י על במדבר י״ג:ל״ג

1הנפילים (lit., the fallen ones) — Anakim who were descendants of Shemchazai and Azael who fell from heaven in the generation of Enosh (cf. Targum Jonathan on Genesis 6:4 and Rashi on Niddah 61a s. v. בני אחיה).

2וכן היינו בעיניהם AND SO WE MUST HAVE BEEN IN THEIR EYES — We heard them say one to another; “There are ants in the vineyards that look like human beings (Sotah 35a).

3ענק — They were thus called because it seemed as if the sun was draped around their necks (מַעֲנִיקִים) because of their height (Sotah 34b).