Carl Anton Theodor was born in Stockholm Kungsholm to undisclosed parents 11 December 1867.
Birth record: Kungsholms kyrkoarkiv, Födelse- och dopböcker, SE/SSA/0011/C I/12 (1862-1875), bildid: 00026601_00151, sida 149
https://sok.riksarkivet.se/bildvisning/00026601_00151
He was fostered out from the Stockholm orphanage more or less immediately, with the name Carl Anton Theodor Lundblad.
Munsö (AB) AI:15 (1866-1870) Bild 1600 / sid 154 (AID: v88461.b1600.s154, NAD: SE/SSA/1538)
In 1871 he was sent in fosterage in Liared, Älvsborg county (farther from Stockholm)
Liared (P) AI:9 (1867-1874) Bild 91 / sid 82 (AID: v44109.b91.s82, NAD: SE/GLA/13329)
When he left for America in 1889 he was a farm hand in Norra Åsarp, also Älvsborg county.
Norra Åsarps kyrkoarkiv, Husförhörslängder, SE/GLA/13403/A I/14 (1874-1894), bildid: C0044705_00167, sida 185, rad 10,
https://sok.riksarkivet.se/bildvisning/C0044705_00167
This is definitely the person from the Find a Grave memorial, I'm not so sure it's the Carl Lundblad in the photo. Carl Anton Theodor lived nowhere near Ängelholm - and I doubt that he had a woman in his life in Sweden.