What the Bible actually names
The Bible does name some heavenly messengers. Gabriel appears to Daniel and is later sent to Zechariah and Mary with significant announcements from God (Daniel 8:16; Luke 1:19; Luke 1:26-27). Michael is also named, appearing as a powerful angelic ruler who contends against evil (Daniel 10:13; Jude 1:9).
Raguel does not appear alongside them as an angel. There is no passage in the KJV that introduces, describes, or gives a task to an angel by that name. So it would be going beyond Scripture to say that Raguel is a biblical angel.
And I heard a man's voice between the banks of Ulai, which called, and said, Gabriel, make this man to understand the vision.
Why you may have heard the name
The name Raguel is found in ancient Jewish writings that are not included in the usual Protestant Bible. One such work, 1 Enoch, presents Raguel as an angel associated with justice. It has mattered to some Jewish and Christian communities historically, but it is not part of the biblical canon used by most Christians.
That distinction can feel technical, but it matters. A book may tell us something about the beliefs or imagination of an ancient community without carrying the same authority as Scripture. When seeking to know what the Bible teaches, start with the books Christians recognise as Scripture.
A similar biblical name
There is a similar-looking name in Exodus. Moses fled Egypt, came to Midian, and met the daughters of Reuel, the priest of Midian (Exodus 2:18). Reuel is presented as a human being, not an angel.
Names can look different when they pass through Hebrew, Greek, and English spellings. Still, the KJV's Reuel in Exodus should not be used as evidence for an angel named Raguel. The story plainly places him in Moses' earthly family and setting.
And when they came to Reuel their father, he said, How is it that ye are come so soon to day?
Keeping the focus where Scripture does
The Bible certainly teaches that angels are real servants of God. Hebrews describes a vast heavenly gathering, and angels appear at key moments in God's work (Hebrews 12:22; Luke 1:26-27). Yet Scripture usually directs attention away from curiosity about angelic names and towards God himself.
It's fine to explore ancient writings and ask questions. Just hold them in the right place. Let clear biblical teaching shape your faith, and let the angels in Scripture point you towards the God they serve.