If you have Excel 2019 or Excel 365, you can use the function TEXTJOIN to quickly join text in one cell and separate the text with any delimiter, even if you have many rows or columns of data to join.

Learn how to use the TEXTJOIN function in Excel. The TEXTJOIN function can be used to combine data from a range of cells using one or more delimiters.

To merge or combine the first and last names in Excel you can make use of the CONCAT Ampersand, Flash Fill or TEXTJOIN functions or formulas.