What does Ishaan mean?
From Sanskrit ishana (ईशान), 'ruler, master', also a name of the sun and an epithet of Shiva (lord of the northeast direction). Glossed both as 'the sun' and 'lord/ruler'.
What does Rishi mean?
From the Sanskrit ऋषि (ṛṣi), 'a seer, sage, inspired poet' — the title of the sages to whom the Vedic hymns were revealed. A firmly established classical word.