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Greetings,
Here's the information we found on "Eyar Agilulf."
The documentation you found is cribbed from a 19th-century name book which had a lot of inaccurate information. In particular, it uses "Teutonic" to refer to a broad range of languages, from German to Norse to Old English.
We researched your name in late-period German and in other major Germanic languages.
"Eyar" is an Old Norse name which is more correctly spelled "Eyiarr." The oldest dated example we found is from around 1000. (1) After 1300 the name was more commonly spelled with an initial "/O"--an "O" with a slash through it - rather than an "E", as in the Old Swedish "/Oiar."
Various forms of "Agilulf" were common in most of the Continental Germanic dialects of the later first millenium. (2) In medieval Germany it remained popular in southwestern Germany until the 15th century, typically taking such forms as "Egelolf" and "Egilolf". Later, toward the end of the 14th century, it also appears as "Eglolf". (3, 4, 5)
If you use the Old Norse given name "Eyiarr", you'll want an Old Norse patronymic to go with it. "Agilulf" isn't Old Norse, but one of its many variant forms is "Egiolf", where the "gi" is pronounced much like English "y". The result is very similar to the Old Norse name "Eyiolfr", though the two names are not related. "Eyiarr Eyiolfsson" would be a believable 13th century Old Norse name.
If, however, you want a late-medieval German persona, we recommend that you use the surname "Egelolf" or "Eglolf," depending on the exact period you're looking for, and some given name used in southwestern Germany after 1300. One possibility somewhat similar to "Eyar" is "Eckard", which was moderately popular in the 14th century. (6): "Eckard Egelolf" would be a fine 14th century German name.
We hope this has been helpful, and that we can continue to assist you.
In service,
Alan Fairfax
Academy of S. Gabriel
(1) Lind, E. H. "Norsk-Islandska Dopnamn ock Fingerade Namm fran Medeltiden," under "Eyiar."
(2) Mu:ller, Gunter. "Studien zu den Theriophoren Personennamen der Germanen."
(3) Socin, A. "Mittelhochdeutsches Namenbuch."
(4) Brechenmacher, J. "Etmologisches Wuurterbuch der Deutschen Familiennamen."
(5) Bahlow, H. "Dictionary of German Names."
(6) Mulch, Roland. "Arnsburger Personennamen."