Rashi on Genesis 31:53/רש"י על בראשית ל״א:נ״ג

1אלהי אברהם GOD OF ABRAHAM — Here the word אלהים is holy (i.e. it is the Divine Name). (Genesis Rabbah 74:17)

2אלהי נחור THE GOD OF NAHOR — Here the name is non-holy (i.e. it is a designation for an idol) (Genesis Rabbah 74:17).

3אלהי אביהם THE GOD OF THEIR FATHER — Here the name is non-holy (Genesis Rabbah 74:17).