How common are "arrove" and "arriven" (vs. "arrived")?

Solution 1:

Historical

According to OED, these forms did exist (not necessarily with your spelling), as it mentions in its entry for arrive (v):

In 14–15th cent. occas. aphetized to rive; and inflected after strong verbs, with past tense arove (rove, arofe), past participle ariven (aryven).

This is historical (so I'm not sure why Wiktionary lists arrove).

OED gives this example:

His nauye greate..In Thamis aroue.
_{1470 J. Hardyng Chron. xlii}

The Middle English Dictionary gives other examples:

Ascalus & Alacus auntrid to lond, And aryuen full rad with þere rank shippes.
_{c1540(?a1400) Destr.Troy (Htrn 388) 5792}

But he ne koude arryuen in no coost Where as he myghte fynde..Two creatures acordyng in feere.
_{(c1395) Chaucer CT.WB.(Manly-Rickert)}

The 1830 Book of Mormon uses "arriven" at least four times, e.g:

And again: They were wroth with him, when they had arriven to the promised land, because they said that he had taken the ruling of the people out of their hands; and they sought to kill him.

Dialects

"Up-State New York":

Arrove for arrived appears to be an analogous form based on some word like dive-dove.
_{The Dialect of Up-State New York: A Study of the Folk-Speech in Two Works of Marietta Holley}

Smokey Mountain English:

Irregular verbs may be treated as regular verbs and vice versa, or they may be treated as irregular in a different way from more general dialects (arrove, blowed, costed).
_{American English}

Solution 2:

Historical Linguistics: An Introduction by Lyle Campbell (MIT Press, 2013) (originally published in 1988) suggests these forms are developing or are naturally generated:

Analogical extension (somewhat rarer than analogical levelling) extends the already existing alternation of some pattern to new forms which did not formerly undergo the alternation. An example of analogical extension is seen in the case mentioned above of dived being replaced by dove on analogy with the 'strong' verb pattern as in drive/drove, ride/rode and so on, an extension of the alternating pattern of the strong verbs. Other examples follow.

(I) Modern English wear/wore, which is now in the strong verb pattern, was historically a weak verb which changed by extension of the strong verb pattern, as seen in earlier English werede ' wore', which would have become modem weared if it had survived.

(2) Other examples in English include the development of the nonstandard past tense forms which show extension to the strong verb pattern which creates alternations that formerly were not there, as in: arrive/arrove (Standard English arrive/arrived), and squeeze/squoze (Standard squeeze/squeezed).

Solution 3:

They used to be more popular than they are now (but "arrived" has always been at least 100x as common).