Here is a Posuk that starts with a Gimel and ends with an Aleph

איוב פרק-יג-ט"ז  גַּם הוּא לִי לִישׁוּעָה כִּי לֹא לְפָנָיו חָנֵף יָבוֹא

Here is a [nifty website](http://www.ateret4u.com/online/f_00720.html) where you can look up Pesukim that begin with a letter you desire and end with a letter you desire. There are some names that have a combo that does not exist. See [here](https://judaism.stackexchange.com/questions/3137/posuk-for-name-at-end-of-shemona-esrei/3145#3145) for what one can do in such an instance.