친숙해요 · 친숙했어요 · 친숙한 (+noun)
familiar, well-known, close
Example
이 노래는 한국 사람들에게 아주 친숙해요.
This song is very familiar to Koreans.
Word parts
친 close+숙 ripe, familiar
Literally 'close and well-acquainted'.
Good to know
친숙하다 = familiar to people (N에게 친숙하다); 익숙하다 = being used to something yourself.