What does Rudra mean?
From Sanskrit rudra (रुद्र), the fierce Vedic storm deity whose name is traditionally derived from a root meaning 'to roar/cry'; it is a well-known epithet of Shiva. A divine name with connotations of awe-inspiring power.
What does Ishan mean?
From the Sanskrit ईशान (īśāna), 'ruler, master'. It is an epithet of the god Shiva, also denotes the sun and the north-eastern quarter (one of the dikpalas). A genuine, well-attested Vedic/classical term.