This is the 611th most frequent Armenian word.
սուրեն
"Սուրեն" (Suren) is an Armenian male given name.
Here, 'Սուրեն' is used as a proper noun, referring to a person's name.
Սուրենը սիրուն նվեր պատրաստեց իր ընկերոջ համար։
Suren prepared a beautiful gift for his friend.
In this context, 'սուրեն' refers to the sharpness as an adjective associated with the knife (in Armenian, adjectives can directly qualify nouns).
Նա վերցրեց սուրեն դանակն ու սկսեց կտրել գրեթե անհնարին նյութը։
He took the sharp knife and started cutting the almost impossible material.
Here, 'սուրենությունն' derives from 'սուրեն' and describes the sharp quality of the gaze, used metaphorically.