Kaarlo is not commonly used as a baby boy name. It is not listed within the top 1000. Within the family of boy names directly related to Kaarlo, Charles was the most popular in 2012.
Baby names that sound like Kaarlo include Caarlo, Karel (Czech, Dutch, and Slavic), Karle (English), Karlo, Karol (Czech and Polish), Kerel, Keril, Keryl, Kiral, Kirall, Kiril (Slavic), Kirill (Russian), Kiryl (Russian), Korel, Kyral, Kyrall, Kyrell, Kyrill (German), Carel (English), and Carley.
† approx English pronunciation for Kaarlo: K as in "key (K.IY)" ; AA as in "odd (AA.D)" ; R as in "race (R.EY.S)" ; L as in "lay (L.EY)" ; OW as in "oak (OW.K)"