וַיִּקְרָ֛א אֶת־שֵֽׁם־הַמָּק֥וֹם הַה֖וּא בֵּֽית־אֵ֑ל וְאוּלָ֛ם ל֥וּז שֵׁם־הָעִ֖יר לָרִאשֹׁנָֽה׃
And he called the name of that place Beth-el, but the name of the city was Luz at the first.
Read kabbalistic (mystical) interpretation of Genesis 28:19: and classical mystical sources.