Norse
Freyr
peace, fertility, sunshine
Celtic (Irish) tradition. See the whole pantheon.

He took Brú na Bóinne from his father, the Dagda, by a trick of words. He fell in love with Caer in a dream; she turned out to be a swan.
Deities in other traditions who share a theme with Aengus Óg: love, desire and fertility. This is overlap in one area only.
Norse
peace, fertility, sunshine
Norse
love, desire, magic (seiðr)
Egyptian
love, music, joy
Mesopotamian
love, war, the morning and evening star
Hindu
fortune, prosperity
Hindu
power (shakti), marriage, mountains
Hindu
love, divine play, the Gita's teacher
Japanese (Shinto)
dawn dance, entertainment, joy