"And your name shall be Abraham" (Genesis 17:5). Rami bar Hama said: At first the Holy One, blessed be He, gave him rule over two hundred and forty-three limbs, and in the end He gave him rule over two hundred and forty-eight. And these are the additional ones: two eyes, two ears, and the head of the body [the male organ].
How the New Name Gave Abraham Mastery Over Himself
Yalkut Shimoni on Torah 81:8
וְהָיָה שִׁמְךָ אַבְרָהָם. אָמַר רָמִי בַּר חָמָא, בַּתְּחִלָּה הִמְלִיכוֹ הַקָּדוֹשׁ בָּרוּךְ הוּא עַל רמ"ג אֵבָרִים וּלְבַסּוֹף הִמְלִיכוֹ עַל רמ"ח וְאֵלוּ הֵן, שְׁתֵּי עֵינַיִם וּשְׁתֵּי אָזְנַיִם וְרֹאשׁ הַגְּוִיָּה.