I'm looking for verses for my Hebrew name Yehudah Yitzchuk to use during the shmona esrei. Is there more than one to choose from? Is there a link to the source(s)?
See this page Both Yehuda and Yitzhak are listed. Many Siddurim such as Art Scroll have a list of verses for all Hebrew names. See the rules in the next paragraph.
Technically, any verse that starts with the 1st letter of your Hebrew name and ends with the last letter of your Hebrew name is valid. There may be more than one verse fitting that criteria for certain names. However, personally, I don't have the time to manually hunt for them. Perhaps there is a computer program that can detect these?