# Yahweh of hosts ... says this

Jeremiah often uses these words to introduce an important message from Yahweh. See Jeremiah 6:6. Jeremiah sent a letter to Babylon telling the exiles to prepare for a long stay. A false prophet in Babylon wrote back to the chief priest telling him to punish Jeremiah. Even though Jeremiah had prophesied the exile, the Jews still did not believe him. 

# in your own name

"based on your own authority and reputation"

# Maaseiah

This is a man's name.