Call yourselves by the names of the Prophets. The names dearest to Allah are Abdullah and AbdurRahman, the truest are Harith and Hammam, and the worst are Harb and Murrah. (Sunan Abi Dawud 4950)
Name yourselves with the names of the Prophets. The names which Allah Almighty loves most are ‘Abdullah and ‘Abdu’r-Rahman. The most truthful names are Harith and Humam. The ugliest names are Harb and Murra. (Al-Adab Al-Mufrad 814)
The most loved names to Allah are ‘Abdullah and ‘Abdur-Rahman. (Tirmidhi Vol. 5, Book 41, Hadith 2833)
Personally, I love Maryam for a girl, and Abdur-Rahman for a boy. May Allah put barakah in your pregnancy.