Mashal is an indirect Quranic name and its details are here: Mashal
Jamil is another spelling of Jameel and its details can be seen here: Jameel
Mashal is used for both boys and girls. Jameel is used mostly for boys in Arabic, but in other countries it is used for both boys and girls, especially in American cultures.
Since Mashal and Jamil have good meanings, Mashal Jamil is also a good name that means "beautiful lantern", "beautiful source of light".